Ryo Takagi is a trumpet player on the brink of major success with his band, yet he is also a natural fighter whose blood boils when he engages in serious combat; this trait earned him the nickname B.B. ("Burning Blood"). However, after suffering a total defeat at the hands of a young man named Jin Moriyama, Ryo decides to swap his trumpet for boxing gloves to secure a rematch on Moriyama's terms: inside the boxing ring.