| 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 |
| Name | Character | Episodes |
|---|---|---|
| Ai Kayano | Futaba Ooki (voice) | 24 |
| Chiwa Saito | Chizuru Himeno (voice) | 24 |
| Yurika Kubo | Cha-Komon (voice) | 24 |
| Kikuko Inoue | Kino Kohinata (voice) | 24 |
| Fumihiko Tachiki | Principal (voice) | 24 |
| Erino Hazuki | Akane Mizunashi (voice) | 24 |
| Shizuka Itoh | Mato Katori (voice) | 24 |
| Miyu Irino | Peter (voice) | 12 |
| Ai Kakuma | Kotori Misaki (voice) | 12 |