After moving from Tokyo to a small seaside town, 15-year-old Futaba is captivated by the ocean views and the vast expanse of water which she finds laid out before her. Unbeknownst to her, Futaba’s fascination is shared by Hikari, who has lived in the town her entire life, and the two girl’s lives intermingle unexpectedly when the introverted Futaba meets the outgoing and exuberant Hikari as one of her new classmates.

Before she knows it, a whole new world is opened up to Futaba – a sparkling, shimmering world that exists under the sea, as her new-found friend helps her confront her fears and anxieties through the form of scuba diving.

As her circle of friends grows, and with her confidence burgeoning, so Futaba finds the strength and self-assuredness to grow and develop with the support of those around her in this quietly touching and charming tale of friendship and finding yourself.

Unaired episode included with the seventh and final Blu-ray volume of the TV anime.

Kohinata Hikari and Ooki Futaba have together found joy in many things through scuba diving and the most everyday of events. Hikari was born and brought up in a small oceanside town on Izu, and Futaba moved there from Tokyo, but the two polar opposites met at Yumegaoka High and instantly hit it off. The always-reserved Futaba found her perfect foil in the cheery and optimistic Hikari, and their friendship gave her the courage to take the first step and experience many of the smaller joys in life. She also took the Open Water Diver exam and passed, and now she has her sights set on the Advanced Open Water Diver certification.

This once-in-a-lifetime high school life is still only beginning. Their magical days filled with wonder won't end as long as they keep walking together.

[Source: Crunchyroll]