Izawa Mitsuru (played by Soshiki Kusa), is a young man who grew up in an orphanage and still frequently returns to help take care of the children there. He has a good relationship with Manaami (played by Kyoko Fukada) who volunteers at the orphanage, but they always have disagreements on how to educate the children. Mitsuru tells everyone at the orphanage that he's now a regular employee of the Miyagawa General Food Corporation, but in reality, he's just a temporary janitor in their building. Moreover, he has another secret - this proud owner of a "stomach as vast as the universe" and insatiable appetite is also the undefeated champion of the underground gambling event "Food Fighter" held by the Miyagawa General Food Corporation. The 3 million yen prize money he wins each time is all anonymously donated to the orphanage. The "Food Fighter" is an event organized for the entertainment of wealthy individuals who have lost their vigorous appetites due to age, combined with gambling. Due to Mitsuru's overwhelming strength, the organizer, the president of Miyagawa General Food Corporation, can only keep sending stronger opponents his way one after another.