Après avoir grandi dans un orphelinat, Mitsuru Ihara a commencé à travailler comme gardien chez un grand producteur de denrées alimentaires. Ihara retourne souvent en visite dans son ancien orphelinat, en prétendant être un homme d'affaires important. Mais il y a un autre secret plus important : il est le champion en titre d'un concours de restauration clandestine organisé dans l'entreprise. Deux concurrents s'affrontent pour savoir lequel d'entre eux peut emballer le plus de nourriture dans un délai donné. Le noble Ihara, avec neuf victoires consécutives, fait toujours don de l'argent de façon anonyme à son orphelinat. Les circonstances entourant ses victoires sont cependant souvent surprenantes et généralement inhabituelles.

The president of a large food production company combines gourmet eating and gambling into an underground eating contest, or "Food Fight," in the basement of his company. After growing up in an orphanage, Mitsuru Ihara starts working as a custodian at the large food producer. The pleasant, kind Ihara often visits his former home, pretending to be an important business man, not the blue-collar cleaner that he really is. He also has a bigger secret, which is, he is the reigning champion of the underground eating competition held at the company. In it, two contestants battle to see who can pack away more food within a set time limit. The noble Ihara, with nine consecutive wins, always donates the prize money anonymously to his orphanage, despite the fact that he wins millions. The circumstances surrounding his victories, however, are often surprising and usually unusual, perhaps unrealistic. He also wins by a very small margin, by only 1 point in most cases.