Taison Maeda's Teiken High School class goes on a field trip to the Kansai region of Japan, which is where Taison is from. Taison's little brother Youkou sent a message to Taison & his older brother Fujio that their father, Monson, is sick and that they should return home to visit him. This trip back will also allow Taison to put some closure on his past regarding his friend Naoto & his ex, Haruka.

Trouble finds Maeda, a good-for-nothing outcast with dreams of becoming a boxing champ, soon after enrolling at Teiken High School. His cavalier clumsiness has a way of attracting attention from gang leaders, school staff, and the precocious schoolgirl Chiaki. When a dangerous new gang leader threatens to upend order in the school, Maeda puts his training to work — along with every brain cell he can muster — to protect the balance of power.