Three sisters live together in a large house in the city of Kamakura. When their father – absent from the family home for the last 15 years – dies, they travel to the countryside for his funeral, and meet their shy teenage half-sister. Bonding quickly with the orphaned Suzu, they invite her to live with them.

Aoi Nishimori's parents moved to another city for work, but Aoi didn't want to transfer to a new high school. She stays behind and lives in an apartment by herself. Shūsei Kugayama moves in next to Aoi's apartment. Shūsei is a very popular student at their high school. Due to a mistake, Aoi makes the sprinkler go off in his room. Until Shūsei's room is fixed, he stays with Aoi.

In 1980s Italy, a relationship begins between seventeen-year-old teenage Elio and the older adult man hired as his father's research assistant.