A downloadable game for Windows, macOS, and Linux

Please check out our side game!




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!
-Cost of $20-$25 depending on the final asset count

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 a body pillow cover? We have one available!

Order form: https://forms.gle/vgvLcQa6X4TWeLdD6

Wanna see early previews? 

Join our discord! Parival Inc, Public Server!

Other social media:

Twitter: Parival Games @ Twitter

Instagram: Parival Games @ Instagram

Facebook: Parival Games @ Facebook

1) sprite over sprite interaction in Jun's office [RESOLVED]
2) error with the phone not closing correctly [RESOLVED]

Install instructions

Download the correct archive for your OS and unzip.


UPDATDED1stDegreeDemo-1.1-win.zip 645 MB
UPDATED1stDegreeDemo-1.1-mac.zip 644 MB
UPDATED1stDegreeDemo-1.1-linux.tar.bz2 650 MB

Development log

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(1 edit)

So I know that it is coming out in 2021 but do you know when exactly in 2021 it will becoming out?

Wait so you play as a copycat killer hunting for a serial killer? or did i read that synopsis completely wrong. 

As someone who played the demo: yeah. Rei is hunting the serial killer by trying to figure out how he does his murders by copycat killing.

I bought the side game.It looks awesome. I would recommend making the text larger for the full game.  It is a bit too small and the reading doesn't flow fully. I would not say that if I didn't think it looked awesome. 

Thank you for the feedback! We'll keep it in mind for the main game. 

Show post...

this. this right here is why i love yoai.

played the demo, loved it! about to buy the side game omg

I'm so excited to play this game. I just bought the side game and I'm about to play it now. Please keep working hard! We appreciate the effort!

Darn it, I just found out about this game. I was so looking forward to buying the beta.

Hello! I was just wondering how to purchase the side game? I can't seem to find a link for where to buy it directly?

The side game went up earlier today! Here is the link if you still need it: https://parival.itch.io/1st-degree-what-a-lovely-summer

waiting patiently for the full version! very well written visual novel, the artwork is beautiful and the voice actors make it so much lively!

fkn LOVED the demo, the CGs are amazing and i think the game is so well written!! Can't waaaaaaiiitttt

hi, i downloaded the game but ... how do you play it ? im new on itch so dont really know how the downloads and such work


Hi there! To play the demo, after you have downloaded the files, you have to extract them to a folder. Then, find the .exe application with the game logo to play.

Is the full version gonna be free? O.O


No, the full game will be between $20-$25 depending on the final asset count.


Oh no...okay, thanks anyway


I saw the full version will be released this year but I had to play the demo, and honestly this is one of the best games I've ever played. I love the characters and their voices, and playing as Rei feels like a whole other level. The art and tone of it all dragged me in, and it really felt like I was in the game. The pace is really nice and I can't find any complaints from my time playing it. Super excited for the full release!


I'm glad you enjoyed playing it! Unfortunately, the full version will most likely be released next year, since the content of it increased. However, we do have a side game (with the same characters) coming out in a few weeks. Update about that will be tomorrow. ^^

Aw ahah well if the content is increased then I can't complain! I know it'll be great.  I'm so ready for the side game!!




We will! I hope it'll live up to everyone's expectations! 



Any update on this game or the side one? I neeeeed more of the twins in my life after the demo


Side game coming this month for sure! Update this Sunday!


Loved the demo! Can't wait for the full release! <3 

waiit, are we playing as Rei, correct? I am so sorry.... I'm just confused!

hah, yes 


how did i only just now realize that leo and griffith don't have the same last name


The game text kinda small, it hard to read and concentrate. And I wish it had black border too cuz it even harder to read with the bright scene/BG...


Love this but just one thing that's bugged me just a lil - the correct term for injuries sustained before death is antemortem (or perimortem if sustained at time of death), not premortem.


Feel's like a really good damn story with a funny,gore and sex scenes... seems perfect to me! Also omg Aiden VA is melting my ears(and everything else). The art is amazing, the music too!! I'm really looking forward to play 1st Degree!! keep the good work guys! <3


I'm curious to when the official release date is.. I'm so excited for this game!!!


The suspense is killing meee


AAA I really want to play this game. It looks amazing!! Congratulations to all people that worked on this, Really good job!!


I am so excited for the full release.  I'll 100% be grabbing it. Love the art style, love the concept! Can't wait to see the full thing. 

Happy to hear that! I hope you'll also enjoy our side game when it's released! 


I need more!!
I just spent the rest of my afternoon playing this and not only is the soundtrack amazing (this includes the ringtones, I love Aiden's!), the story is riveting!

I tried downloading the demo for Windows, and when I extracted the files, it said they're corrupted. Any solution to it?

Oh, btw, this sounds like a really interesting game. Hope everything turns out okay, I can't wait to see the full release! <3

There are a few things you could try:

1. Test extraction with a different program (7zip, winrar, etc.)
2. Test on a different pc if available
3. Test redownloading the files and extracting again
4. Ensure the download isn't getting interrupted (check size of archive, if it's super small it's likely failing due to Internet connection)
5. Download the folder and drag the contents to your desktop or into another folder, or right click it and extract it to another folder
6. Check to see if your firewall is blocking one of the files

Let me know if any of these work! If none of these do, you could also look up some commands to input into the command prompt.

is the only way to support the game right now the patreon? will there be pre-orders for those of us who found out about it after kickstarter?

Right now the only way is through patreon or to order a daki cover. It is the best way for you guys since there is content we only release on patreon. We are not thinking about pre-orders right now, but we may think about it in the future! Other than that, there is a mid-development side game coming out soon that will also help with funds for the main game.

Full BL scenes, I can't wait for the full release!


I adore this game! Disappointed I hadn't heard about it when it was still being crowdfunded.

Really excited for the future of this game! Adore the art style.

I don't know how to play .after the character called me the game finished as I didn't even played anythin

This was just a demo. The full game is not released yet.

Would you guys ever do beta testing?? 

And I have never been so excited for a game before!

It was a reward during our kickstarter, but we don't plan on offering it outside of that since it was sort of like an 'early bird' reward.

I'm glad you're excited though! Please stay tuned for our upcoming side game~  


when are you gonna release this game?

Very nice demo. The voice acting was pleasant to the ear, and I enjoyed the characters. ^^ The only thing that really bothered me tho, was how small the font on the phone was. It was a bit hard for me to read the glossary. ^^"

va il y avoir une traduction francaise ?


This is amazing! I can't wait for the full game <3


The demo has me hooked :) Can't wait for the full release!

I absolutly loved this demo and can't wait for more! I still can't decide who my favorite route would be!

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