heavenly school y/n x Muzan

One day muzan bumps into a girl
Later, on falling in love with her, turning her into a demon eventually, she becomes upper moon zero,  later on, they eventually die going to a room, where God gives them a punishment he sees fit After  they are punished they go to a school named heavenly with all the Hashiriya , demon slayers and left over demons they all remember each other what happens next is a  mystery