Ichiro Sato, an average high schooler, keeps stumbling into compromising situations with Kana Kojima, a strict Japanese-language teacher known at Kawanuma West High as the "demon teacher." Despite her fearsome classroom reputation, Kojima turns flustered and accident-prone whenever Ichiro is around, landing them both in bathrooms, infirmaries, and changing rooms with alarming regularity. Subsequent arcs pair new teachers—Mayu Matsukaze and Hikari Hazakura among them—with their own students in equally embarrassing encounters that drift toward romance.