Red, alias Tonpuu Chun, operates as one of four members of the Phantom Thief Tonchinkan. He serves as the group's Kung-fu master, alongside mechanic Chinpei, psychic Kanko, and their teacher Nukesaku. The team executes whimsical heists targeting worthless objects or junk, prioritizing minimal damage while eluding Inspector Dokuoni. Red initially participates in issuing calling cards to announce thefts, parodying Phantom Thief conventions. As the narrative unfolds, the focus transitions from heists toward slice-of-life school gag comedy centered on Reinbou Junior High, diminishing the prominence of thievery elements.