16 years ago, there was an occurrence of zombies in western Mexico. They rapidly spread around the world through the transmission of a virus. The world was thrown into panic with the appearance of the first zombies, but because their movements were slow and they were also feeble, zombies were not commonly perceived to be such a threat and their existence became an everyday affair. In Tamagawa ward in Japan, there is a special welfare division where all the defective staff members from other divisions have been transferred. The primary responsibilities of this division are to manage and capture special insurance subjects (residents carrying the zombie virus or zombified residents). Akaba Shinsuke is one such staff member, but he is in no way motivated. In his 25 years, he has had no one to call girlfriend and leads an uninspiring life. However, one day, Tachibana Rin, a girl with the looks of an idol and skills of a martial artist is assigned as a rookie.