A downloadable game for Windows, macOS, and Linux

We're live on kickstarter! Make sure you support us and play the demo! 


1st Degree is a r18+ (or M) boy's love game in development by Parival, a recently created visual novel development team focused on boy's love visual novels. We're currently seeking a few voice actors. The game will feature 4 routes- Aiden, Jun, Minami, and the twins Griffith and Leo- but, Rei will eventually kill off at least 3 characters. Choose who will live, who will die, and who will end up with Rei!

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. Although, he begins to develop certain... urges. 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 also maintain his normal student life while dealing with his desire to kill, leading him to the ultimate choice - Who will he choose to love, and who will he resolve to kill?


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

Wanna see early previews AND exclusive CG/Art 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

Published Jul 27, 2017
StatusIn development
PlatformsWindows, macOS, Linux
Tagsbl, boys-love, bxb, Crime, drama, gay, murder, Mystery, shounen-ai, 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

View all posts


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After playing the demo, I have to say, I am sad to have missed the kickstarter.

 I did notice that one of the voices had `demo` listed. Does that mean that it wasn`t the final voice? 

This is definitely going on my `want to buy when it comes out` list. ^_^ 

Also yay twins as an option! 

Yes,  he was meant to be the voice actor for the demo; however, we have brought him on as the main voice actor for that character.

Thank you for your interest! We're glad you enjoyed playing the demo!

In censorship options the red box means that it's censored or does it mean it isn't?

We will actually be revamping the censorship option for the full release to be more of a 'yes/no' function instead. You do not really have to worry about it for the demo because there really isn't much to censor in it.

Does anyone know when the Full version of the Game is going to be Released ???

The full game will be released in late 2018 or early 2019 if more things are added to the game!

Wonderful,  im looking forward to it. And i was curious how much am i going to have to pay to buy fill version or is it free ???

The full game will be in the range of $10-$13 for 100k-150k+ words as well as additional stories. We aren't completely set on the price yet, but it won't be more than $15 at the max. 

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Awesome , Thanks for saying around what it will be. I Have Plenty of time to save the cash now.

It's no trouble at all! Please let us know if you have any more questions.

Can't wait for the full version, it was so fun to play! and i'm so highly interested in what happens next.

Glad you enjoyed playing it! 

That moment when you're not sure if Minami is as sane and cute as he looks, lol. Ironically the kid creeps me out for some reason (yanderealertmaybe?) Also, can't stop thinking if he's gonna be the seme with Rei or not xD
That would be a great twist ( ͡° ͜ʖ ͡°)

Well not everyone is what they appear to be, but that's something to explore in the full game!

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will there be updates to the demo? :) need.more.twinzies.giiiiive iiiit D: 


There will not be an updated demo, but we will be releasing a few CGs here and there as well as some random character art from time to time. :)

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Is there any possibility that you will release the game on Steam (once it is finished)? I would very much love it, and would buy it upon release -- without hesitation. 


We may do so in the future, but we are unsure if we would only release a clean version on it. We will discuss it more in the future, but for right now we are planning on just an itch.io release. However, it is definitely something we want to do, even if the only way to do so is to make it rated M rather than r18+ for Steam specifically. Itch will still have the full r18+ version option.

(Edited 2 times) (+1)

I have seen different creators release a safe version of their game, but then have an R18+ patch to download on their home site for those who bought the game off Steam. If it is ever something for the future, that might be an option so those on Steam could get the other parts as well and not miss out! 

Looking forward to the release of the game!

literally me the second rei first appears on screen :

We're glad our little psycho can entice you! ;)

omg yes and the twinzies gaaah!!! :D

i will build a shrine and worship until the new update xD XD i have run out of games to play. i need entertainment

really interested in how this will play out, was a little disappointed in the voice actors though, image quality and expressions were great. 

Thank you for your critique! 

We know not everyone will enjoy the voice acting which is why players have the option to disable any voice that they dislike, or all voices if they do not want to listen to them! Please use the option if it will make your play-through experience better. 


I personally have to say the detective and Jun are my favorite. Also if Rei is not me XD

I'm Kai and I just wanted to say hai (totally not funny). I love this game, I did notice that the day never changes, but this was just the demo so I understand! Heh, and here I was trying to keep a eye on the date in the game lol. anyway good game! can't wait for the full version. And remember don't give up and don't let your dreams be memes. (god why am i like this). I hope your having a good day and if not WHO HURT YOU ILL KILL EM. and goodbye :D


Thank you for your feedback! The day change coding may have messed up when we changed some of the music files in the game, but we will make sure it is fixed for the full version.

We're glad to see Aiden and Jun getting some love! 

Super interesting concept! Looking forward to the whole game. Will the full version be free or commercial? 

Thank you for your feedback and interest! The full game will be commercially available through itch; however, we may release free/low-cost DLC in the future. 

When going back to play a second and third time to make new choices, I noticed that the "Skip" button doesn't work. I'm not sure if that's a coding error or if it was left like that intentionally, but I hope it's something that will be fixed once the full version is released. It would also be helpful to have the regular save option instead of just the quick one, and to allow us to save on choice screens. It's much easier for me going back when I can just click on the load screens with choices so I can pick new options right away instead of having to start over every time. And at least letting us skip to the choices would be better than going through the whole thing.

Also, the demo gave us a choice screen for all the love interests except for the twins. We didn't have any options with them, while we got two for interactions with Jun. It's not a big deal but I would have liked to have equal opportunities with everyone.

Overall I enjoyed the game though, and am looking forward to playing the full version.

Thank you for your feedback!

We are already aware of the skip function issue and it will be fixed for the full game as well as the save/load feature. 

Regarding the twin's scene, we felt that a decision was not necessarily needed for their particular conversation. There will of course be more options for each route in the full game. So, rest assured! Each route is getting the same amount of love.


Finally managed to find the time and play the demo. It was a very enjoyable and unique experience - I've never seen a game where you play as a character such as Rei. I especially enjoy the fact that while he's a cold blooded killer when trying to discover the Doctor's methods, in his everyday life he's such a grouch and can actually be pretty funny too. It's a nice contrast. I'm also pleasantly surprised by Minami - I don't usually like characters like him, but he really has a charm I didn't expect to see!

The demo was pretty short so I'm not able yet to make a really detailed review, though I must mention something that really bothered me. In the settings, you have the "Censorship" option - but I have no clue if a yes means "Yes, apply the censorship" or if it means "Yes, the gore/sex will appear", or if you'd rather have the opposite, then I don't know if a no means "No, don't apply censorship" or "No, don't show the gore/sex". It's really confusing as I don't know if I have to check or uncheck it to actually get to see the mature content, and even when I was trying both things during the slighly gorey CG, I didn't see any difference so I guess it wasn't hardcore enough to apply for this...

Thank you for your feedback!

We're glad you enjoyed the characters! 

Regarding the censoring option, we'll make it more obvious in the full game in order to avoid more confusion. The CGs receive different types of censoring depending on how graphic they are, so in this case, the demo CG did not need much censoring so the difference in negligible. 

Are you able to host the demo on itch.io itself or something? I tried to download from mega but it keeps freezing early on in the download - 27% and claims that it's downloading at a good speed but the completion rate doesn't move at all even after 2 hours. Initially I had problems trying to even get mega to start downloading so I don't feel too optimistic about being able to try the demo.

We have uploaded new files directly on our page, sorry for the inconvenience. Please let us know if you're having any more troubles downloading the demo!

Sorry for my last response! I did manage to download it just fine this time, and I enjoyed the demo so I backed your KS. I look forward to the full game! :D

Glad to hear! Thank you for your support!

I keep trying to download the demo, but it's not working. :(

Have you disabled your pop-up blocker? Since the demo is contained in an external link, you will need to disable the blocker in order to get the link to be able to download it. You just have to click on the blocker which appears on the right side of the address bar when you click on the download demo button. Once you click it, you have the option to either click on the link directly or to disable the pop-up blocker for our page. 

Let us know if it works!


Of course. I feel silly, but I'm glad that was the problem. Thanks!