[Machine Translation] I love you, Chizuru". On the day of fireworks at the beach, Chizuru, a junior in high school, confesses her love to Ritsu. However, one year earlier, Chizuru had been rejected by Ritsu. In fact, Ritsu has lost his memory of that day! Meanwhile, Hanami meets her classmate Tsukimura on the rooftop of a building overlooking the sea. They share a relationship in which they both share the pain of not being able to talk about it with others. They promise to have fireworks one year later, but... This is a story of love and adolescence of high school students over the "memory" of summer vacation.