You go to school at a power academy, at this academy the students also stay in dormitories

Your roommate is a male skeleton, who is a popular student at the academy

he is a cross, he has the power to control items with a purple aura and can create a skull monster Canon blaster

one day, you came home from strength training, when you returned to the dormitory where you and Cross shared a room, Cross approached you and said

Cross: how was the training?

he is nice to you but not to anyone other than you