Ocean Waves follows the high‑school romance of Morisaki Taku and Matsuno Yutaka in Kochi, Japan. When Rikako Muto, a girl from Tokyo, transfers to their school, she initially keeps to herself, quickly earning a reputation as a snob. Taku, who has a crush on Rikako, feels jealousy as he notices her growing closeness with his best friend, Matsuno. Despite the escalating rumors and gossip at school, Morisaki maintains that there is no romantic relationship between him and Rikako.