After a few months of relative calm, the Sasaki Agency is inundated with requests to solve a series of unnerving cases that all appear to have arisen from a single incident. According to eyewitness reports, a man in black has been showing up at a Tokyo hospital and miraculously healing children of diseases and genetic conditions with no known cures. Yet the recipients of his treatment quickly become unrecognizable, exhibiting strange shifts in personality and singing to herald the arrival of a deity known as Lady Osara. Over the course of her investigation, Rumi realizes that local legends concerning the moon could be the key to resolving the case. But between her encounters with the paranormal growing increasingly dangerous, and her assistant Aoyama becoming increasingly distant, can Rumi turn things around before more people become victims?