First of all, the gameplay is really good! It's also a puzzle game in the style of something like Tetris, I won't go into deep detail but it's basically the " You gotta match 2 or more blocks of the same color" concept, however it's really interesting, it hard to get into, however once you figure it out, it can be really fun.

Now, the STORY is where it truly shines, the main thing is that there are 4 high schoolers (that rabbit girl named Irisu Kyouko is one of them) going on a trip and slowly each one of them disappears, however there's more to this story though, so keep exploring. The amazing thing is that this game is one of the earliest games to use fourth wall breaking elements as a main feature, even before Doki Doki Literature Club, and not only does it use it greatly, it has one of my favorite fourth wall breaking moments, and I won't spoil it.

If you want an explanation of this game that's 10000x better than mine, watch ToadBup's video on it, however there are spoilers there, so it's best to experience the game blind unless you need help. Here's the link to the game (there's the Internet Archive link but as of writing this, it's temporarily offline): Irisu Syndrome! | Cheerful Tomboy (wordpress.com)