Hairi Takahara, after an unpleasant incident, he uses the recent death of his grandmother as an excuse to come to the island to take care of her estate sale. Once there, he gets to know four girls: Shiroha Naruse, who forgot her summer vacation; Ao Sorakado, who is pursuing the legends of the island; Kamome Kushima, a high-class girl looking for a pirate ship; and Tsumugi Wenders, a younger girl trying to find herself.
E1
A young boy with a wounded heart begins a new life on a quiet island.
E2
The boy with the broken wings begins to settle into life on a tropical island.
E3
A mysterious chest is uncovered in the attic of a school.
E4
The crew goes searching for keys to a treasure chest.
E5
Hairi travels across the island in search of a pirate ship.
E6
Hairi learns the story of the Higenekos.
E7
Hairi meets a girl sitting on a lighthouse. She is trying to find out what she wants to do.
E8
Tsumugi decides to make a balcony on the lighthouse out of the empty Paringles cans she's been collecting.
E9
Hairi and Shizuku look for Tsumugi, but Hairi ends up lost himself.
E10
Hairi gives Tsumugi a summer break she'll never forget.
E11
Hairi starts over at the island and meets a new girl.
E12
Hairi ignores Ao's warning not to come back into the mountain at night. As it turns out, it was for good reason.
E13
Ao continues her search for the butterfly she seeks.
E14
Ao and Ai have a lot of catching up to do.
E15
Hairi meets a lone girl on the island.
E16
Hairi visits the main island and talks a little about his past.
E17
Hairi and Shiroha need to make arrangements to prepare for the upcoming ritual. Shiroha's visions become clearer.
E18
Hairi tries to grant Umi's wish.
E19
Umi's true hopes for summer vacation are revealed.
The day of the ritual draws near.
E21
As summer draws to a close, Hairi begins to forget.
E22
Time moves on after summer ends.
E25
Nanami's true identity is revealed.
E26
Umi's story comes to an end.