Amanchu! Advance

あまんちゅ！！あどばんす

The story takes us into the world of scuba diving through 2 high school girls; Hikari Kohinata, full of vitality and extroverted and the beautiful but shy Futaba Ohki. At the beginning of the school year, the two girls immediately became friends and joined the diving club. It is the occasion for Hikari, specialized in this field, to make her discover the so particular universe of the sea to his new friend.