Newlyweds Nana and Shota move into an apartment building whose residents play a game declaring who they'd like to kill. Then, the murders start.

Hideo Suzuki is a 35-year-old mangaka assistant, whose life seem to be stuck around his exhausting but low-paying job, unfulfilled dreams, strange hallucinations and unsatisfying relationships. He sees himself as a supporting character in his own life, has low self-esteem, resulting in frustration. One day, the world as Hideo knows it is shattered by the presence of a disease that turns people into homicidal maniacs, whose first instinct is to attack and devour the nearest human.