Because he knew the two of them were in love, Nagatsuma makes the hard decision to break up with-to betray-Aoi. Now burdened with a painful wound no one can see, Nagatsuma is assigned to Section Zero, a division of the police force tasked with handling investigations of a paranormal nature. However, the young man sent to collaborate with them knows of Nagatsuma's relationship with Aoi. Will he keep this information to himself or use it to his advantage?