Set on an island in the Seto Inland Sea, this film tells the story of 15 years between Aono Kai, who transfers to the island from Kyoto, and Inoe Akimi, who grew up on the island and is troubled by parental issues. The two, both lonely at heart, are attracted to each other and fall in love, but are at the mercy of the destinies they each carry.
Aoi Miura was born and grew up in Toyama Prefecture. He has an indecisive personality and does not like summer. He was the focal member of the high school swimming team, but he now works as an assistant at a small architectural office in Tokyo. One summer day, he meets his childhood friend and first love Akari Serizawa. During their school days they spent everyday hanging out together until the fireworks night in their 3rd year of high school. That night, Akari suddenly disappeared.
Iida Shippei moves with his mother to the remote island of Origoshima. He transfers to the island's only high school, Origoshima High School (nicknamed "Oriko"). However, shortly after his transfer, it's announced that Oriko will be merged with a regular mainland school. Naturally shy and with few friends, Shippei is touched by the warmth of the islanders and his fellow students. Wanting to create a final memory at the school, he proposes that all the students perform a choral song together. But this very choir becomes the spark that drives a wedge between his friends' hearts…
