Itadaki! Nariagari Meshi

At Omori High School, a school for delinquents, everyone is gunning for the 35th head, Meriken, and the days are filled with fighting. First-year student Kenny challenges Meriken, but is easily beaten up. He looks up at the sky and cries at his own powerlessness. However, when Meriken accidentally eats Kenny's lunch, he is shocked by how delicious it is, as if he's been hit with a heavy punch! Realizing that his cooking skills can be a weapon, Kenny vows to capture the stomachs of all the students and rise to the top of Omori High School!

(Source: Tokuma Shoten, translated)