Professional boxer Sota Kusunoki has gained popularity for his fighting style, where he goes headlong into his opponents. However, years of fighting have taken their toll on his body, and he is forced to retire by a doctor's stoppage. He takes the opportunity of his retirement to marry his girlfriend, Sachiko, and start a new life, but he is completely useless in society and is made acutely aware of the harsh reality of his situation. One day, a mysterious man who claims to be a fan of Sota's receives an offer to fight in an underground mart...
