Natsumi and her childhood friend Haruyuki attended the same high school class, but she noticed that he had become distant and formal towards her. One day, Natsumi wakes up to find a miniature Haruyuki doll in her room, which surprises her as no one else can see or hear it. As she goes to school, Natsumi discovers that the real Haruyuki still exists and strives to find out where the tiny version of him came from and if she can reunite the two.