Perched on a hill near a coastal town rests Coquelicot Manor, a boarding house managed by Umi Matsuzaki's family. Juggling household responsibilities with high school life, Umi gets involved in a school crisis: the demolition of a historic clubhouse for Olympic preparations. In a bid to save it, students unite, including Umi who joins forces with the newspaper club. Here, she forms a deep bond with Shun Kazama, an enigmatic orphan with a mysterious past. As Umi and Shun delve into his origins, they unravel surprising connections that bind their fates closer than expected.