Hello, the game is a fan-made game of Koikatsu. I'm not selling this game or saying it's mine. The game is completely free. Even, it says it when you open the game!
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It's a VN type game where you play the only guy in a girl's academy and you have to found a romance club. But it is very easily moddable and has a pretty good character studio. There are some patreons of just guys making accurate models for the game of your favorite gacha game and anime characters. So you can bone them.