Amane lives alone in an apartment, and the most beautiful girl in school, Mahiru, lives just next door. They've almost never spoken—until the day he sees her in distress on a rainy day and lends her his umbrella. To return the favour, she offers him help around the house, and a relationship slowly begins to blossom as the distance between them closes…
After becoming an official couple, Amane Fujimiya and Mahiru Shiina step into a new chapter of their lives together. As they navigate school, summer vacation, and the attention that comes with making their relationship public, the two grow closer through shared experiences, personal challenges, and heartfelt moments. With their feelings no longer hidden, their gentle romance begins to deepen beyond the walls that once kept them apart.