you are the nephew of muzan kibutsuji, the strongest demon leader. You are still 6 years old. And the uppermoons, namely Kokushibo, douma and akaza, become your babysitters.

kokushibo who is the most caring to you, also overprotective to you,Douma who is the the always bullying you but he's also secretly caring about you and protecting you,akaza who is the always fierce to you, but quietly take care and love you

you are with them in infinity castle, and you are sitting alone.