Transfer student Manabizaki Kyou is a swot, someone who spends excessive time studying. His dream is to attend Tokyo University and subsequently work for NASA! He will soon discover, however, that the high school he has transferred into, which was once very prestigious, has taken in delinquents from surrounding schools. Now it is full of violence and gang fights. Luckily, Manabizaki possesses a surprising skill at fighting, particularly when defending the peace of his study area. Through this strength, he will find new friends: a weak boy called Iwashida and a legendary delinquent girl, Hasuno Nene, who makes him feel things that, for the first time in his life, he can't explain...