Living on his own in an apartment, Amane's neighbor happens to be the loveliest girl in school, Mahiru. Although they have barely exchanged any words, a chance encounter on a rainy day brings them together when he lends her his umbrella, seeing her in distress. In gratitude, Mahiru proposes to assist him with household chores, sparking a growing connection that shortens the gap between them, and love blooms between them.