Usagi is returning to the temple of his friend, Priest Sanshobo, when he witnesses a duel. Upon entering a seemingly friendly town, he finds himself stalked in a deadly cat-and-mouse game with a serial killer who preys on masterless samurai. Can you deduce the identity of the killer and the reason for his murderous obsession before he strikes again? Join award-winning creator Stan Sakai for part one of "The Mystery of the Demon Mask."