There is a hell and a heaven in the hell world Demons or Devils are not able love angels from heaven and heaven rules the angels and saint or not able to love demon or devils and the major rule is demons devils,angel,saint or never supposed to cross each other if they break the rules they will be erased from the world but one day A demon named Dazai Osamu and a angel named Chuuya Nakahara crossed each other

Dazai:Well this is a shocker if it isn’t an Angel.