The protagonist, Shippei Iida, 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…