Hikari Kohinata is an energetic fifteen‑year‑old girl obsessed with diving. Growing up in a seaside town instilled in her an unbounded passion for underwater swimming. It is so boundless that even far from the sea Hikari never stops "living" it. Whether on land or at depth, she always feels as if a scuba set hangs over her shoulders and never tires of honing her diving skills. On the first day of high school, on her way to school, Hikari meets her future homeroom teacher, Mato Katori, and is surprised to learn that she too is a diver. That same day she meets Futaba Oki, a new classmate who has recently moved here from the capital. Friendly Hikari quickly figures out how to approach the shy, long‑haired beauty—and soon they are friends. Friends who, according to Hikari, should share interests after bringing Futaba into the diving club, even if their interests don"t initially align.
