Lost Souls Meet Under a Full Moon

When Hirase arranges an appointment with The Go-Between, she doesn't expect a teenager to show up. Dressed in a duffel coat and carrying a notebook, he communicates with the dead - at least, this is what Hirase has pieced together from the Internet - offering them a chance to travel back into the real world. What is the mystery behind this smart young man with the notebook and why does he insist on meeting in, of all places, a freezing cold hospital carpark?