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
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | The Story of the Girl and the Ocean | 2016-07-08 | 25 min |
| Season 1 | Episode 2 | The Story of Doing Something Bad with Hikari | 2016-07-15 | 25 min |
| Season 1 | Episode 3 | The Story of the Secrets to Excitement and Hapiness | 2016-07-22 | 25 min |
| Season 1 | Episode 4 | The Story of Excitement and the Despairing Heart | 2016-07-29 | 25 min |
| Season 1 | Episode 5 | The Story of the First Time at Sea with Friends | 2016-08-05 | 25 min |
| Season 1 | Episode 6 | The Story of the False Wish | 2016-08-12 | 25 min |
| Season 1 | Episode 7 | The Story of the End of Rain | The Story of the Beginning of Summer | 2016-08-19 | 25 min |
| Season 1 | Episode 8 | The Story of the Feelings Yet Hidden | The Story of the Things Yet Unknown | 2016-08-26 | 25 min |
| Season 1 | Episode 9 | The Story of the Memories You Can't Erase | 2016-09-02 | 25 min |
| Season 1 | Episode 10 | The Story of Losing Your Way in Today | 2016-09-09 | 25 min |
| Season 1 | Episode 11 | The Story of the Cat and the Kitten | 2016-09-16 | 25 min |
| Season 1 | Episode 12 | The Story of the Blue World | 2016-09-23 | 25 min |
| Season 2 | Episode 1 | The Story of One Summer Night and a Confession | 2018-04-07 | 25 min |
| Season 2 | Episode 2 | The Story of Midsummer and Sparkling Eyes | 2018-04-14 | 25 min |
| Season 2 | Episode 3 | The Story of the Pro and the Expert of Happiness | 2018-04-21 | 25 min |
| Season 2 | Episode 4 | The Story of Autumn and a Tender Happiness | 2018-04-28 | 25 min |
| Season 2 | Episode 5 | The Story of the Jet-Black Mermaid and the Solitude of 18m Under | 2018-05-05 | 25 min |
| Season 2 | Episode 6 | The Story of a Halloween Night's Dream | 2018-05-11 | 25 min |
| Season 2 | Episode 7 | The Story of the Neverending School Festival | 2018-05-18 | 25 min |
| Season 2 | Episode 8 | The Story of Fleeting, Unfulfilled Desires | 2018-05-25 | 25 min |
| Season 2 | Episode 9 | The Story of Tears and an Endless Dream | 2018-06-01 | 25 min |
| Season 2 | Episode 10 | The Story of a New Beginning and New Feelings | 2018-06-08 | 25 min |
| Season 2 | Episode 11 | The Story of Cold, Flames, and Well Wishes. | 2018-06-15 | 25 min |
| Season 2 | Episode 12 | The Story of Future Possibilities | 2018-06-22 | 25 min |
| Art | Chikako Shibata | Art Designer |
| Production | Noritomo Isogai | Producer |
| Production | Youko Ueda | Producer |
| Directing | Kiyoko Sayama | Series Director |
| Production | Hirotaka Kaneko | Producer |
| Production | Shosei Ito | Producer |
| Visual Effects | Yoko Ito | Character Designer |
| Art | Chikako Shibata | Art Direction |
| Directing | Junichi Sato | Series Director |
| Sound | Gontiti | Original Music Composer |
| Writing | Kozue Amano | Comic Book |
