Hikari Kohinata is a cheerful 15 year-old girl who lives near the ocean and she spends much of her time diving as a result. On her first day of high school, she meets a teacher who also likes scuba diving. There's also a 16 year-old classmate, Futaba, who gets dragged along in Hikari's maelstrom as soon as they meet at school. --- **Links:** - [Author's Twitter](https://twitter.com/aquaria2go) - [Anime Season 1 on ANN](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=17700) - [Anime Season 2 on ANN](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=20692)