Issue 1: A new serial killer has appeared in Gotham, and he may have connections to the training Bruce Wayne received as a young man in Japan. Does the murderer know that Bruce Wayne is the Batman? Issue 2: Bruce Wayne must confront his past and examine how his time in Japan as a young man, training to become Batman, affected him...and whether those experiences somehow led to the killer now rampaging through Gotham's underworld. Issue 3: The mystery of the deadly masks is uncovered, as the killer reveals his long-standing, deep-rooted connection to the Dark Knight and the time they spent together as students in Japan years ago. Issue 4: Events come to a head as Batman must defeat the Oni — but before he can confront it, he must first face his own troubled past.