He is the Physical Education (P.E.) teacher and guidance counselor. He's such a spartan that several complaints have been issued about him from the PTA, and the Board of Education might even have to make a move. Giyu is Tanjiro's school counselor and known at school as the "man who never smiles". He doesn't like to make conversation with any of the other teachers. He works as a teacher in Kimetsu Academy, a private school. Demons do not exist in this timeline.