Fudatsuki Kenji is known in school for two things: for being a delinquent and for having a sister complex. He constantly follows his sister Kyoko around, fixing her giant ribbon and chasing off any boys who might be interested in her. However, the truth is much stranger than people believe. He actually doesn't have a crush on his sister-- in fact, he likes Hibino, the only girl in class who isn't afraid of him.