The story unfolds in a summer that feels like an extension of a man's boyhood memories. Still on the brink between childhood and adulthood, he finds himself linked to the ghost of a young woman from the World War II era. Together with other spirits of young women from that time, they embark on adventures, discovering each other and traveling through time through their supernatural connection. While he struggles to make his crush on her a reality, a friend, a girl his age who pretends to be a boy, also seeks his attention.