Ryo Takagi is a skilled trumpet player who is on the cusp of achieving stardom with his band. However, he is also a born fighter, whose passion ignites when he engages in serious combat, thus earning him the moniker "Burning Blood" or B.B. Following a crushing defeat at the hands of a formidable adversary called Jin Moriyama, Ryo abandons his trumpet and opts for a pair of boxing gloves, resolving to challenge Moriyama once more according to his preferred mode of combat: inside the boxing ring.