Angel Densetsu

Angel Densetsu (エンジェル伝説, Enjeru Densetsu) is a manga written and illustrated by Norihiro Yagi.

Plot
Seiichirou Kitano is a naive and kind boy with the heart of an angel and the face of a devil. Upon entering his new school he is presumed to be a villainous heroin addict, and unwittingly becomes the leader of the school's thugs, all thanks to his frightening face.

His new "friends" have great expectations of him, seeing him as a frightful demon. Kitano himself on the other hand, loathes violence and is blissfully unaware of the situation he is in.