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On her way to school, Hikari races against her homeroom teacher, Mato Katori, who she discovers to be a fellow scuba diver. Later that day, Hikari drags Futaba to the school's Diving Club, where they try on some drysuits and take a dip in the pool. Moved by Hikari's high spirits, Futaba decides to join her in diving.
Episodes
1The Story of the Girl and the Ocean 2The Story of Doing Something Bad With Hikari 3The Story of the Secrets to Excitement and Happiness 4The Story of Excitement and the Despairing Heart 5The Story of the First Time at Sea With Friends 6The Story of the False Wish 7The Story of the End of Rain / The Story of the Beginning of Summer 8The Story of the Feelings Yet Hidden / The Story of the Things Yet Unknown 9The Story of the Memories You Can't Erase 10The Story of Losing Your Way in Today 11The Story of the Cat and the Kitten 12The Story of the Blue World