A downloadable game for Windows, macOS, and Linux



Please feel free to check out our fully funded kickstarter!


1st Degree is a r18+ (or M) boy's love game in development by Parival, LLC, a visual novel development team focused on boy's love visual novels. The game will feature 4 routes - Aiden, Jun, Minami, and the twins Griffith and Leo. 

A city on edge as a serial killer roams the streets...

Frustrated by one unsolved murder after another, forensics graduate student Rei Kuroshima decides to get his hands dirty to solve the crimes. He resolves to copy the killings to chase the serial killer known as "The Doctor" in order to figure out how the murders were accomplished. Along with his supervisor Aiden Steele, a detective oblivious to Rei’s identity as “The Copycat” killer, he must piece together a trail of evidence to uncover the identity of “The Doctor.” At school, however, Rei must maintain his normal student life while dealing with his obsession.

-4 Routes
-300k-400k+ word script
-9+ Endings
-Partial Voice acting (may transition to full in the future)
-14+ track OST, each character has their own theme
-40-60+ UNIQUE CGs with 2-3 variations for a total of over 100
-Multiple r18+ content, including gore and full BL scenes, in every route!
-Future side stories!

1st Degree is a highly story based visual novel. We are focusing on trying to portray the best story we can with great writing and art adding to the novel. Each route will have its own premise and you will have to play at least 2-3 routes to get a true feel of the story! And remember--choose wisely. 


Have any questions you'd like to ask the development team? Send us an email! We'd love to hear your comments and questions about the game! Just send us a message at parivalgames@gmail.com

Want to support us? Become a patron! 

Patreon: Parival

Interested in buying merch? Check out our redbubble!

Parival's RedBubble - 1st Degree Merch

Wanna see early previews? 

Join our discord! Parival Inc, Public Server!

Other social media:

Twitter: Parival Games @ Twitter

Instagram: Parival Games @ Instagram

Tumblr: Parival Games @ Tumblr

Facebook: Parival Games @ Facebook

Updated 12 hours ago
StatusIn development
PlatformsWindows, macOS, Linux
GenreVisual Novel
Tagsbl, boys-love, bxb, drama, Gay, murder, Romance, vn, Yaoi

Install instructions

Download the correct archive for your OS and unzip.


1stDegreeDemo-1.0-win.zip 482 MB
1stDegreeDemo-1.0-mac.zip 481 MB
1stDegreeDemo-1.0-linux.tar.bz2 485 MB

Development log

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Viewing most recent comments 1 to 40 of 60 · Next page · Last page

Just finished the demo, and it's amazing so far! The story is intriguing and all the characters are unique and have great chemistry with each other already. I've been searching for a BL VN  with a crime/mystery theme and this is perfect! So far I really like Rei's snarky attitude and Aiden's personality the best, I'm super excited to play his route once the game comes out. I really adore the art, the CGs and backgrounds are stunning! Awesome work so far, I can't wait for the full release!

I'm glad you enjoyed it! I hope you'll like the updated demo as well when it is released~

I have two question.sWhat it was your inspiration when creating every character.like what inspiration was when you thought of Minamis design and his personality the same with the other characters(Also secondary characters too).And i know all the routes are not finished but what its the most interesting route or what route is going to be the most interesting from your own opinion.Also your opinion about each one of the characters?

1) Most of the characters I already had a general idea of how I wanted them to look. The original designs were a conglomeration of what a few of the original voice actors wanted since they started the production with me. However, over time and through the redesigns, I drew them how I think they would look best. For example, with Jun, I felt a lack of inspiration to draw any more outfits for him because I did not like the way I drew his body. Therefore, I redrew him to make him more proportionate and made him fit a kind of playboy persona. Personality wise, they were just created through writing. We started with a basic concept for each of their personalities, but writing has brought it out more than just planning and outlining.

2) In my opinion, I would say either the Twins' or Jun's route. In reality though, each of the routes have their own charm and will be interesting in their own way. Each of the characters are important to the story. 

3) I enjoy writing each one because they all have personalities that allow for me to feel like I can just pick up the phone and call one. The characters feel real to me since I'm obviously writing them, but I want them to have realistic qualities rather than just something flat and shallow. I probably relate to Rei the most out of all the characters--but it doesn't mean that I don't favor all of them.

btw i love the new designs of each character!

hello its me again.I wanted to ask a question . does the game is going to be released on steam too?

We will be going through the process to add it to steam once the game is fully released.

I love your game! And the charecters are just amazing! Can't wait for it to be fully  released :D  Are you considering of making an alpha or beta versions avalible to play?

Glad you like the game!

There will be a beta version of the full game available to those who backed that tier during our kickstarter.

This was amazing. The best visual novel on the market, A BL Murder Mystery game, that's fully voiced, has gore and sex? This is the best. Any hint on roughly when this will release?

Thank you! I'm glad you enjoyed it! The rough estimate is late summer of 2019.

I absolutely LOVE this demo~ The artwork and voice acting are beautiful and needless to say I'm definitely hooked! I can't wait to see where you guys take the story and I'll be eagerly waiting for the games official release, even if it's give or take a year away ^w^

I'm glad to hear you liked the demo! The support means a lot~

I was hooked the moment I started the game. Maybe deep down i'm a psychopath! The background music was amazing i'm not sure who did it but, it was suspenseful and, fit the mood and, flow of the game so well. The artwork was amazing. I really was sad that this was only the demo and, not the full game. Hoping when the full game gets released SPOILER;

We get to murder most of his aqauintences. This visual novel really reminded me of jigsaw the latest saw installment. Although i'm sure it's just concidence as, the whole story looks very original. There is only one flaw to point out and, it's something a similar creator has struggled with. (can't think of their name right now) That's audio to background music. I'm sure there is options to lower and/or raise bgm but, at it's stock original levels characters voices get lost in the louder music being played. I was like I said engrossed by the music that I didn't bother to adjust levels. Just giving a heads up as, i'm sure the voice actors worked really hard in their roles.

Thanks for making a video on the demo! I'm happy to know you enjoyed it! Don't worry, there will be plenty of murder throughout~

The sound is something that will be fixed for the full game. We were aware of the issue and will have it fixed for the future so it shouldn't be a problem.

(3 edits)

The demo was so good, the writing is fantastic and the VA really brings the personalities to light! Can't believe I missed the kickstarters :l Hopefully you'll be selling the game on here when you release it.

P.S. May be in love with Griffith and Jun <3 

Glad you enjoyed it!

The game will be available on itch as well as steam in the future!

(I love them too don't worry.)

You've made my labor day!! Thank you!! 

So that means the game will be released in 2019 but any specific month? or depends ?also i want to say that i love the demo and i saved money on steam just for the game.

i hope that you guys will release it on steam after youre releasing it here!

Also good job everyone. the best demo i ever played of a visual novel.

The game will be released in Summer 2019, we don't have a specific month right now since some things might be pushed back or somethings might be finished sooner so it is just an approximation. 

We're happy to hear that you enjoyed the demo! It was a lot of effort so it's nice to hear it was appreciated. 

Hands down the best demo i've ever played, really looking forward to the full game! 

Thank you so much! That's an amazing compliment! 

just a few quick questions 1: will there be a bad ending where you get arrested for murder 2: will there be a route where you can kill everyone and finally 3: will there be any mini games thanks bye

The first two, you'll have to play the game to find out. Third, no there will not be mini games.

Just finish playing demo.
I'm very excite for the full game.

Since your kickstarter is already fully funded. will there be pre-order or something? I don't want to miss this nice vn.

We are not planning on doing pre-orders for the time being. However, you can follow us on either Kickstarter, itch.io, or any of our other social media to get the updates which will eventually have a final release date posted within one.

Ugh! I love this so much!


Glad you like it!! Thanks for making a video on the demo! 

(1 edit)

I love this game so fucking much. I'll be patiently waiting for the full game, keep up the good work!

Thank you! Glad you enjoyed it!!

So the demo only goes up to the part I mentioned. okay! Thank you. I promise I wont bug you anymore

Okay, I promise this is my last question. I IS JUST SO FULL OF THE EXCITEMENT! Do we have a general month or time of the year that you guys will release it at? I'm not trying to rush yall. Take yall's time and make it AMAZING (just like u have been doing). I is just soooooo excited.

It should be released Summer of 2019, possibly a little later. Thanks for the support!

OMG no problem. I just can't find many Visual novels that I am:

a) Interested in


b) my parents will let me play

So I'm just super excited and once again tysm for tolerating my bullcrap

is it like a demo or something?

Yes, it's just the demo. The full game will not be released until next year. 


:( :( :( :( :( sad face sad face SAD FACE!

It's really great though. I love it so far. Do you mind if I ask the ages of the charcters?

And maybe a possible dish that Rei likes..... I may or may not be thinking about making a fanfiction   >////>

The character ages and other info are on their character sheets on the old kickstarter campaign: https://goo.gl/yBGPYG

A short rundown is:
Rei: 24
Aiden: 35
Jun: 32
Leo/Griffith: 20
Minami: 18

Rei's favorite food is curry and favorite drink iced coffee.

djaaaaa!!! *head explodes* 6 year age differance beetween me ship. *cripiling depression* 

thank you so so so so much for tolerateing my ridculessness.

*two miutes later* 

just checked the profiles.


omg on Minami's profile: spending time with rei, cooking with rei. lol

okay so I got up to the part where is says this(Bold):

The Docter has killed again.

Now what? Is that like as far as they have gotten or what? I am confuduled. I have no idea how to continue the story. 


im sorry for bombarding you but i need help with something.When i try to run the game it doesnt work and it says. could not run. Is it missing?...... if i extract the files from the zip, would it work????

Extract the files from the zip to run it. 


Hello. I'm downloading this game now but i would like to know if you have to pay for the full release. If so how much?. Thank you for taking time to answer my stupid question. BAIIIII

btw im gunna play it now and i already know im going to go for Jun

Thanks for the interest! The full game will be commercially released for the range of $13-$17 depending on the final word count--which is lining up to be around 200k+.

I love this game so much!!! Does the full version have a release date yet, cuz I can't wait! :D

The full game should be released in the later half of 2019! We'll have a set release date early next year.

Holy cow, I just played the demo and I'm already hooked HHHHH. I love Leo lmao.  Can't wait for more, I eagerly await its full release! 

Glad to hear you enjoyed it! Always nice to know Leo has a few fans~

I LOVE THIS SO MUCH! I can't wait for more omg I'm excited!

Super happy to hear!

This was really good!!made my heart giggle a lot too! i cant wait for more!

Thank you! Glad you liked it!

Love this game can't wait for more <3

Happy to hear!

Please! Please! Please! I need more! This game is amazing so far I just ahhhhhhhh!

Thank you! Glad you enjoyed it!! 

I love the game so much so far!! I would loove lots of gore and blood, that shit's 10/10 yknow? I'm not a big fan of the whole twin thing, being a twin myself, not so into that level of 'brotherly love'. But it's fine because Jun and Aiden are hot as fuck. The art is really good and the cgs make me nut in five different directions. 11/10 :)

Glad you like it!! Definitely a fan of Jun and Aiden myself! 

I love this game, and when I suddenly get an itch about a game, I get crazy all over it. AND THIS DEMO HAS GIVEN ME THAT ITCH. But I have a tiny question, what does it mean by '' Rei will eventually kill off at least 3 characters. ''? like kill like a love interest or..? 

Super happy you like it!

Yes, '3 characters' as in 'three of the four routes must die.'

How's the voice acting search going?

This is upsetting, because the demo is SOOOOOOOO good, but idk when the full game is coming out, i can't find any other games like this, it's really cute and unique. 


Glad you liked it! 

The full game is still in progress and should be released sometime in 2019.


2019? D: my heart just broke

I'm impressed really. Glad to find another game like this that doesn't have typos like some yaoi games do. Love this game. Cool background scenes, characters, story plots and really appreciate that voices are also being included even in the demo. Love this game. Really looking forward to play full release of this game.

We're happy to hear that you enjoyed it so much!!

O...M....G....this was amazing!the fact that had me shocked more was this is only a demo and such a good demo!im so excited for the full game.i have two questions if you dont mind,do you have a favorite character and why?also how  did you though about the design of the characters like how you came up with it?

Glad you enjoyed playing it!

For me, it's hard to choose between them since I have to love them all.  Aesthetically though, I like Aiden the best - solely on body type/looks/age. 

To design the characters, some of the voice actors (who are my friends and have been since the start of the project) came up with how they would want their character to look. So, I elaborated and created them. The original start-of-project cast VAs were for Rei (Minami at the time), Aiden, and Jun. Rei's voice actor was originally supposed to be Minami, so he's where Minami's concept came from (aka cute, pink, cinnamon roll). Otherwise, Rei, Leo/Griffith, and the side characters were my own concepts, with the input of the rest of the team.

This was such an amazing game, especially considering it being only a demo and all the potential it  may have. Very nice work and can't wait for the full release. Do you have a time range for the release date as far as years?

Glad you enjoyed it! 

At this point, it should take a year to a year and a half to finish, but may take longer if needed.

I'm really looking forward to the full game when it comes out! The demo has me hooked! I love the characters, and I'm always up for a murder-mystery. 


Glad it could interest you and thank you for writing the review! 

I loved the demo.  Though when will the full release be uploaded? I honestly would love to play the whole game. thanks  ^~^

The full game is still in progress and does not currently have a set release date.

I absolutely cannot wait for this!! Murder mystery and Yaoi. My favorite ahah

Glad you're interested!!

holy heck this game was FUN probably the best vosual novel ive come across in a long time,  im super pumped for the full release, wheter it be on here or steam i would happily purchase the full game. i can say right of the gate that minami and jun are my two main boys. heres hoping for more!

Thank you so much! We're glad you enjoyed the game and we hope that you'll be just as much in love with it when the full game is released! 

Oh my god I love this so much even if it's just the demo, I'm so ready to buy it! 

Glad you enjoyed the demo!

excellent! loved the demo! can't wait to buy the full game ^^. i'm also one of those who'd like to have it on steam, but since you'll release it here first i won't be patient enough to not get it immediately after release XD - however with a steam key i could add it later.

besides it being BL (with possible 3some, the twins, if i got it right? yay), for which there are still so few titles - hence it's very appreciated - i like the fact that it's not a fluffy VN. this psycho streak of Rei is thrilling, and he's hot af, as are the twins. the other charas are all nicely balanced in their age/style. the main plot is very interesting too, Rei/us being a detective and a killer is a genial idea. beautiful graphics, sprites as backgrounds! and the few CG we got were awesome. hope you guys have everything on your side to finish this amazing game! ^^

Glad you enjoyed the demo!

Yes, the twins are a package deal!

We didn't want to make it fluffy, even though we know not everyone will be interested in such a niche type of BL game. We are happy that you enjoy it though and thank you for the compliments~

I honestly made an account JUST to comment on this project, this demo is the best freakin' thing ever and the major tease ending only piqued my interest more, I really look forward to seeing this game take the VN Yaoi Genre games by surprise!! Also, Jun is my favorite and i love his adorable personality! I love Aiden's mysterious vibe too I really look forward to this. Also, I know it contradicts the purpose of the murder mystery genre but is there a chance there's an ending where no one dies? They're all my precious husbands >.< I could go on forever about why this game is great but i feel sorry for the people who'll read this. but if you've made it this far.. i'll tell you the truth of the world.*mumbles while drooling* cat ears Aiden is best Aiden* .

Thank you for your comment!

We're happy to hear you enjoyed the demo and that the boys are getting the love they deserve~

The game is designed to be played in a way that forces the player to make difficult decisions, so unfortunately for some, the game will not have an ending where no character dies. However, we are doing our best to make sure the game has replay-ability so that the player may experience each of the different routes, particularly in the second half of the game. 

Thanks again! 

Oh.. That's a shame but i think that's appealing in its own little way too, thank you for replying. I have to ask, have you done any previous projects or is this your first? I'd love to check out your other work even if it's not Yaoi related.. though i sure hope it is.. I mean i usually go for yaoi games for the Ecchi stuff @w@ but when playing the demo i was actually enchanted by the story and was simply curious to know what was going to happen so if you have ANY other projects, please let me know thank you!

We wanted to make 1st Degree story-based rather than exclusively fan service, which is why the story may appeal to some but not to others. It may not be as player-personality manufactured as some games since our little psycho has a pretty strong personality compared to a lot of other protags, but we are hoping people will enjoy the role of Maestro of Rei's life. 

We are planning side stories/additional dates which will be more lighthearted for those who can't exactly handle the gore or just skip over it entirely. These will be released a little after the full game is complete.

This is our first project so we are learning as we go! Though we do post updates, our last devlog explained the reason for update delays, so please check it out if you're curious for the lack of activity!

We're glad the story interests you since it is such a niche genre, particularly with the inclusion of Yaoi! But don't worry, the game is r18+ after all, so there has to be some good to come from progressing through the gore and science~

The only thing i'm looking forward to in my whole life right now is sitting in a public setting with a scary-looking detective with bunny ears on. That being said, you've done a great job appealing the game for its story and what's really amazing is the fact that while the story is overperforming, the art and text are great as well It's really rare to see this kind of quality from a first project.  Regardless of how this project goes (Though it's almost certain to be a massive hit), please keep on making projects. I understand you're also a University student with a busy schedule but it's a shame to let the developing team's talents go to waste, i'll stop wasting your time with unnecessary comments like these but I'm so incredibly hyped up about this which rarely ever happens to me and so I'm overreacting. Thank you for keeping up with me and I'll be sure to read progress updates whenever they're available x)~ 

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