Mizu is a young girl who had a near death experience as a child, where she acquired the ability to connect to the Spirit World. She is trying to recover after the sudden passing of her boyfriend, Joel. In his wake he leaves a mysterious trail starting with a metal briefcase that is delivered to Mizu by a man known as Mr. Shoto. As far as she knows, Joel is only associated with Mr. Shoto through his family's business. It seems that as soon as the case is passed into her hands, everything changes.