When she was 10, Toaki was friend with a weird girl named Kilala, they played together with Kilala's creepy dolls, one of them looking exactly like Toaki's deceased mother. But because of Toaki's fault, Kilala died to a fall from a tree.

Now in high-school, Toaki meets with a boy of her age named Wataru and his little sister Kokoro ; somehow, they are in possession of some of the dolls that Kilala owned. Meanwhile, Toaki also see Kilala here and there, and she is still 10!