A boxer who sabotages himself before every fight meets a nun trying to save him, and neither of them knows how to actually do it. The show finds the comedy in watching someone want to change more than anything, then immediately eat a hamburger two hours before the weigh-in. Rumiko Takahashi doesn't write romance, she writes the specific friction between two people who are genuinely trying, failing in real time, and somehow more lovable for it.

Kosaku Hatanaka is a young professional boxer with a fearsome knockout punch and almost no self-control at the dinner table. He keeps eating greasy burgers right before his bouts, which pushes him out of his weight class, and a single hit to the stomach leaves him throwing up in the ring and losing in disgrace. With his coach warning that his next fight could be his last, Kosaku crosses paths with Sister Angela, a novice at a nearby convent. Once she learns she unknowingly helped him break his diet, she sets out to reform him, even as his attention drifts toward her rather than her sermons and his presence makes her own path to becoming a nun harder. The OVA mixes sports comedy with romance.