Ryoko and her friends form Otogi Bank: a social club which specialises in resolving problems for classmates via aggressive transactions. The wallflower Ryoshi is smitten with Ryoko despite rejection and must prove his worth to the rest of the troop.

Ryoko gets a request while the rest of Otogi Bank is out shopping. When gangsters from a rival high school ambush her, Ryoshi gathers the guts to show he's no chump in the face of danger.

Otohime plans to settle the score with a long-time rival by beating her in the Miss Otogi Academy beauty pageant. At her request, the Otogi Bank unleashes on the competition to help her win at all costs.

Ryoshi saves Otsuu, the maid of Otogi Bank, from a whack from a loose baseball. Obsessed with repaying favours, Otsuu starts doing housework at Ryoshi's place to show her appreciation. Her friends take it upon themselves to break her fixation for good.

In Japanese folklore, Oni are evil creatures such as demons, ogres, and trolls. When the Oni (delinquents) at Onigashima High get unruly, Momo hires Otogi Bank to address the issue with the student council president.

Ryoshi hunts down answers about Ryoko's past with Onigashima High's student president. But he'll have to gain her trust to find out the truth.