There is a schoolgirl who carries her own personal chainsaw. She was attacked by a dead body who was created by her classmate one day. As such, she does not understand why she was attacked by a classmate. To find the answer she ventures into the enemy's base. There she finds out the reason for the assault.

Giko Nokomura is a female student at Nightingale Academy, who carries around her very own chainsaw. One day she begins to be attacked by modified corpses created by one of her classmates, Nero Aoi . She tears her way through the corpses and busts into Nero's hideout. Why is Nero so intent on attacking Giko?! The reason will shock you!After her battle with Nero, she encounters a new enemy. It's the leader of the Nightingale Academy Student Council Guardians, Nemesis.

Giko Nokomura is a delinquent girl and a senior in middle school. She struggles to kill zombies who were her classmates.

Luchino's routine morning elevator ride up from her subterranean home on level 138 to her school many stories above turns horrific when the elevator operator is ordered to pick up two passengers from floor 99, the maximum security level. What starts as psychological manipulation soon turns wholly physical as both the cruel convicts and Luchino's own dysfunctional past are unleashed. And then every passenger must fight for his or her survival.