Risa Koizumi is the tallest girl in class, and the last thing she wants is the humiliation of standing next to Atsushi Ôtani, the shortest guy. Fate and the whole school have other ideas, and the two find themselves cast as the unwilling stars of a bizarre romantic comedy duo.

Risa thought life was going great, but she didn't count on her grandpa returning from abroad and taking an instant disliking to her boyfriend. Grandpa is determined to save his beloved granddaughter from an unsuitable match. But will he go so far as to hire a busty beauty to seduce Ôtani?!