I have memories of the future. So said the unknown girl who appeared before Aruto Mozumi, a third-year high school student. Aruto has lost both his childhood memories and the ability to hear piano sounds. Meanwhile, his younger brother Tokio is blessed with a natural gift for piano. Why is it that he alone cannot hear the sound of the piano? Haunted by a vague anxiety, Aruto can't bring himself to confess his feelings to the classmate he has a crush on. The final summer of high school. The guidance of a girl with memories of the future begins to dramatically change Aruto's destiny. A bittersweet and fleeting summer romance. [Description taken from Steam]