Reforming a Bad Seed [Anime Crossover]

Hoshino Tsukasa died and found himself inside the fan game he had made, "Reforming the Bad Seeds." Known bad seeds: Kira Yoshikage, the famous hand fetishist from anime Jin, who would be great in every way if only he were still alive Kibutsuji Muzan, proof that there is no worst, only worse Hao Asakura, a longtime edgelord Oh, this is bad. This game is impossible for any human to play! Hoshino Tsukasa tried all sorts of ways to reform (conquer) the bad seeds: friendship routes, romance routes, family routes. Not a single one worked! After failing N times, Hoshino Tsukasa went dark. He let evil take root in his heart. He would become their rebellious younger brother, walk the paths they were meant to take, and leave the bad seeds with nowhere to go!!! To his utter surprise, his reckless attempt at reforming them actually worked. With the mission complete, Hoshino Tsukasa obtained a brand-new character card. He created a character card based on his original self, then happily made his way to the righteous protagonist group. And yet... Why had all his bad-seed big brothers come looking for him?! My foolish little brother, now that you've turned over a new leaf, come home with your big brother. There is a CP, but it's not decided yet! Synopsis: My foolish little brother! Theme: My foolish big brother!