The Nakano quintuplets are steadily improving academically, thanks to Fuutarou Uesugi's steadfast guidance, despite facing hurdles towards graduation. Nevertheless, their recurrent disagreements and unexpected predicaments hinder their educational advancement and confuse the line between professional and personal interactions with their mentor. Simultaneously, Fuutarou's past is intertwined with one of the quintuplets, which elicits conflicting emotions and uncovers a possible connection. As their feelings become more complicated, they must choose between maintaining their roles as teacher and student or venturing into uncharted territory.