Rikitaro is a musician who dreams of becoming a rock star like Jimi Hendrix or Jim Morrison, but at 27, that dream is fading fast. Ooishi is a three-time world boxing champion who recently retired and has entered the entertainment industry, filming a boxing reality show. These two unlikely figures cross paths one day, though neither thinks much of it until weeks later. A record label gives Rikitaro one last chance to sign a deal, but first, they require him to get in better shape to make him more marketable. He stumbles upon a boxing gym, which happens to be the same location where Ooishi is filming his show. As fate begins to unfold, neither man realizes they will work together to train the greatest boxer ever, surpassing even Ooishi himself.