For the past three years, Akira Tendo has been working for a hellish company where every day is filled with stress! At the age of just 24, he's already worn out mentally and physically, especially since Saori, the attractive accountant for whom he has feelings, doesn't seem to notice. Just as he's about to burn out, a catastrophic apocalypse-like phenomenon is unleashed on Japan, infested by multitudes of hungry zombies. Akira realizes that his life is about to take a turn: no more obligation to go to work! Freed from all constraints, he's determined to make the most of this situation...