Houkago Undead

A high school student named Saro Natsume finds her classes dull and works part-time at a clothing store, dreaming of a future in fashion. One evening, while closing the shop alone, she is attacked by criminals. She is saved by her teacher, Yona-sensei, who is wounded but recovers quickly. It is revealed that he is undead, a reanimated corpse with a head that does not belong to him. Natsume is drawn into a mysterious supernatural realm, where it appears Yona-sensei is not the only one of his kind.