| When Iori Kitahara heads off to college, he decides to live at his uncle's dive shop in Izu named Grand Blue. Iori is looking forward to experiencing college life amidst the roar of the waves, the blazing sun, and his cute cousin who lives with him! However, Iori runs into a group of tough guys playing strip rock-paper-scissors, and ends up joining Peek-a-Boo, the college's diving club! |
| Name | Character | Episodes |
|---|---|---|
| Katsuyuki Konishi | Ryuujirou Kotobuki (voice) | 13 |
| Yuma Uchida | Iori Kitahara (voice) | 13 |
| Maaya Uchida | Nanaka Kotegawa (voice) | 13 |
| Ryohei Kimura | Kouhei Imamura (voice) | 13 |
| Junya Enoki | Shinichirō Yamamoto (voice) | 5 |
| Takuya Eguchi | Hajime Nojima (voice) | 5 |
| Natsuki Hanae | Yū Mitarai (voice) | 4 |
| Shouta Aoi | Mixed voice A (voice) | 1 |
| Show Hayami | Bar master (voice) | 1 |
| Inori Minase | Mixed voice B (voice) | 1 |