There is a small island. Souta visits his aunt's house located on the island. She runs a hotel and he starts working part-time there. One day, he meets a girl, Chihaya, at the coffee shop. They become friends soon and gradually fall in love...
However, this is just a beginning of a tragedy. A while later, he meets Chihaya at the coffee shop. There is nothing wrong with her, but she doesn't remember him...
