In order to sort out grandma's relics, the protagonist Yuri Eaglehara came to Tooshira Island alone during the summer vacation.After walking on the next day, he met a girl with only a few ferries.She let the sea breeze blow her hair, just looking at the border between water and sky.When he came to his senses, the girl didn't know where she had gone.Yu Yili seemed a little lost, but he still walked towards his grandmother's house.There is a Yu Yili's aunt living in her grandmother's house, and she has already started to organize the relics there.When Yu Yili helped organize the relics full of grandmother's memories, she gradually adapted to the "life on the island" that made him at a loss when he first arrived.The encounter with nature that cannot be experienced in urban life.Such an island life reminds him of every bit that he had forgotten and worthy of nostalgia.Meeting a girl looking at the sea.Meet a girl who is forced to search for a fantasy butterfly.Meet the girl who is looking for the recovery of Yi and Pirate Ship.Meet the girl who lives in the tranquil lighthouse.I met my new partner on the island - I once thought that it would be great if this summer vacation would never end.