The free-spirited older sister, Kana (Abe Mikako), and the shy younger sister, Aiko (Hanane Urara), are sisters with completely opposite personalities. Unfulfilled with her daily life, Aiko believes that learning the ending of an unfinished series of novels will change her life, so she decides to visit the author, Kisaragi. Concerned for Aiko, her parents ask Kana to accompany her, and she reluctantly agrees to go along. The two immediately head to the seaside town where Kisaki lives, aiming for her café, but they are hit on by a group of surfers on the beach and end up at a love hotel...