Possibly one of the best VN's I've EVER read WITHOUT A DOUBT. It's so unapologetically disgusting, sick, and twisted all the way through to the end and it lets you know that straight from the get go putting all it's cards on the table the moment you start it. I played through the ENTIRE thing in one sitting on my first playthrough, THAT'S how good the characters, writing, music/sound design, and stakes are. It's truly the meaning of "Art should comfort the disturbed and disturb the comfortable." and that's my favorite thing about it I think. Definitely make sure to get the 18+ patch to TRULY be able to understand Saya and Fuminori's relationship and all the emotions and complexities that it entails. Just make sure you're actually mature enough to handle it's extremely dark, horrifying, and downright disturbing themes, haha.