The daughter of the Koiso-style kobujutsu karate master, initially set on fighting each and every high school delinquent, and convinced that Kitano is evil and very strong. After fighting him, however, she discovers his true nature, and little by little she becomes more or less his girlfriend.

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 schools 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... Note: Includes 5 extra chapters

Angel Densetsu is a story about Seiichirou Kitano, a kind and naive boy with the heart of an angel, but the sinister looks of a devil. This causes many misunderstandings, leading people to assume that he is a villain or heroin addict, and results in a career as the head thug, or "school guardian" at his new school.
 
(Source: Anime News Network)

Ryoko Koiso