Ken Games 004 - Louviers (2016) (Europe Comics)

Peter is a former math student. Forced to abandon his studies in order to care for his father — a professor who has since passed away — Peter throws himself wholeheartedly into boxing, despite his ultimately pacifist natire. His career as an amateur boxer is going so well that he begins to harbor hopes of turning professional. But Peter lives alone, and hides his boxing activities from his friends, just as he used to hide them from his father, for fear of their reactions.