The story follows a young man named Renn Kiriyama who woke up in his school, not knowing that hell has came upon it. Later he met his friend Natsumi Miyamoto, who explained everything that happened while he was sleeping in his classroom while the others had left. After venturing the school for several minutes, they eventually met another survivor, Yuuki Hinata and Ryuu Tendou. The four of them soon realized that there's a mystery going on the school regarding the outbreak...

The story follows a young man named Renn Kiriyama who woke up in his school, not knowing that hell has came upon it. Later he met his friend Natsumi Miyamoto, who explained everything that happened while he was sleeping in his classroom while the others had left. After venturing the school for several minutes, they eventually met another survivor, Yuuki Hinata and Ryuu Tendou. The four of them soon realized that there's a mystery going on the school regarding the outbreak...