An ordinary high school student Aikawa Ayumu was involved in a serial murder case that shocked the society due to an inexplicable fate, but he unexpectedly came back to life. It turned out that the necromancer Yuu, who had met Ayumu by chance before the incident, turned him into a zombie and resurrected him. In addition, there was the female warrior Haruna from the magic world and another vampire ninja girl Sera, and it even evolved into a situation where Ayumu lived with all of them...