The hyperactive teenage scuba diver, Hikari Kohinata, lives in a small town near the sea. On her first day of high school she meets the shy transfer student, Futaba Oki, who is struggling to find a place after moving away from Tokyo. Hikari takes the lead, dragging Futaba into her hijinx, and the two soon become close friends

Ai Kayanoas Futaba Ooki (voice)
Eri Suzukias Hikari Kohinata (voice)
Saori Onishias Ai Ninomiya (voice)
Yuuichirou Umeharaas Makoto Ninomiya (voice)
Kikuko Inoueas Kino Kohinata (voice)
Yurika Kuboas Cha-Komon (voice)
Chiwa Saitoas Chizuru Himeno (voice)
Erino Hazukias Akane Mizunashi (voice)
Fumihiko Tachikias Principal (voice)
Ai Kakumaas Kotori Misaki (voice)
Deko Akao