Hideo Suzuki is still a manga artist’s assistant at the age of 35, but he dreams of making his own debut one day. One day Hideo’s girlfriend is infected by the mysterious virus that turns humans into ZQN, and attacks him! Hideo is shocked and flees Tokyo, taking his shotgun with him. The city is already overflowing with people infected with the virus. Amid the panic, Hideo meets high school student Hiromi Hayakari, and they team together to escape. Hideo and Hiromi seek refuge, along with other survivors, on the roof of a shopping mall where they must shoot ZQNs on sight. Will Hideo be able to protect Hiromi and find a cure for the virus? Can they develop an antibody using Hiromi, who has become a humane ZQN?