Oumori High School is a den of delinquents where strength alone dictates who rises to the top. The school is ruled by its 35th head, Meriken, a fearsome third-year who wears brass knuckles fused to his hands and achieved the top position as a first-year, an unprecedented feat in the school's history. Kenny, a first-year student with a bright and caring personality, dreams of reaching the summit of Oumori. He challenges Meriken in a fight but is easily crushed. Beaten and despairing, he realizes he cannot win through physical combat alone. However, by chance, Meriken tastes Kenny's homemade lunch. The food is so overwhelmingly delicious that it strikes the school's strongest delinquent like a heavy punch. For the first time, Meriken shows interest in someone not because of their fighting ability, but because of their cooking.

Seizing on this, Kenny abandons the path of violence and decides to use his cooking skills as his weapon. His goal becomes capturing the stomachs of Oumori's students and winning their loyalty through food, a strategy he calls becoming the school's "mama." Kenny starts with his own class, 1-B, where he faces a fractured group of hostile classmates. Through a series of carefully prepared dishes, he wins them over one by one. His childhood friends Chabo, a talkative old-school delinquent, and Gussan, a silent powerhouse, are among the first to rally behind him. The lone wolf Sally, who is irritable and avoids everyone, is gradually won over by Kenny's cooking, revealing a deep loneliness beneath his aggressive exterior. Another classmate, the long-haired leader of a rival middle school faction, also falls in line after tasting Kenny's tuna sandwich.

Kenny unites 1-B and declares himself the head of the first year. This draws the attention of the second-year class head, Akkun, a former powerhouse who lost his fighting spirit after being defeated by Meriken during his own first year. Despite his current apathy, Akkun is respected by his peers, including Gori, a second-year who is frustrated by Akkun's lack of ambition and seeks to crush the first-year uprising. Kenny navigates these conflicts not through brawls, but by forging a peace treaty between the first and second years, solidifying his position.

With the first year unified and peace with the second year established, Kenny sets his sights on the ultimate prize: toppling Meriken and the Four Heavenly Kings who serve under him. The narrative follows Kenny's infiltration of the upperclassmen's floor, his discovery of Meriken's secret to strength, and his continued efforts to win over the school's most powerful fighters through his cooking. The story culminates in a final confrontation where Akkun, having regained his fighting spirit, challenges Meriken for the top position. As the battle for the school's head unfolds, Kenny must find his own way to achieve his dream of becoming the school's mama, the one who feeds and unites everyone at the top of the school's hierarchy. The series concludes with the resolution of this generational clash and the question of whether Kenny can finally claim his place.