Rin Kokonoe is a bright and cheerful elementary student who harbors a crush on her teacher, Daisuke Aoki. While much of the narrative centers around Rin's attempts to win Aoki's affection, the core of the story revolves around Aoki himself. He grapples with the daunting task of managing a classroom full of unruly students who are resistant to listening and cooperating. These challenges from his students prove to be the toughest obstacle Aoki has ever encountered in his teaching career.