Tsukiji Saikyou Sushi Densetsu: Nigiri no Umitarou

Umitarou had no interest in the family business until a single word from his admired girl changes everything, and he decides to become a sushi chef. He promptly consults with his father, the owner, but the condition to inherit the shop is to quit being a yankee. Wanting both his fists and the sushi rice, Umitarou gives a shocking answer...! (Source: Akita Shoten, translated)