"Shun, if someone is reincarnated, let them go and do nothing. They must be given a chance to be reborn."

"Grandfather, I hope he does not reincarnate."

To defeat several inhuman monsters, the boy became something inhuman himself.

Sixth-grader Shun Uruma was named "Experimental Subject A" by five classmates and subjected to brutal bullying. His life turned into hell. His only solace was his younger brother, who loved him, and his parents, who protected him. Until the five monsters killed his family.

When he lost everything and faced true hell, a dark "desire" was born inside Shun. He was reborn under the guidance of his grandfather, who served in a secret unit during World War II. Now, four years later, he will face his fateful enemy.

He will not let anyone stand in the way of his revenge.

This is a world where the line between human and monster is blurred. A world where every conversation could be the last. A world where you are the Game Master, and all characters await their turn.

Characters:

Shun Uruma — the protagonist. Hollow, patient, cold-blooded. Trained by his grandfather in everything. Always carries a knife.

Noboru Uruma — Shun's grandfather. Veteran of the Kitayama Squadron. Assassin and torture specialist. Trained Shun in everything. Scar over his left eye.

Kyou Shigoku — leader of the "monsters." Psychopath and genius. Started the bullying as an experiment. Polite, quiet, never raises his voice. Curious how much Shun can endure.

Kyousuke Senkouji — the first. Wealthy, arrogant, a coward at heart. Shot Shun with a pellet gun. First target.

Yuuga Ushiro — the second. Sadist. Laughed when Shun's family died. Runs a brothel. Keeps Karen chained up.

Hiro Madoka — the third. Kyou's lapdog. Knows how to brew poisons. Raped Kaname at the festival.

Daiichi Kuga — the fourth. Enormous. Judo champion. Physical strength. Cautious, does not underestimate Shun.

Andou Midori — Kyou's right hand. Woman with a chainsaw. Killed Noboru.

Jun Shirakawa — Kaname's brother. Manipulated by Kyou. Blamed Shun. Joined the "Revolution Club."

Kaname Shirakawa — Shun's childhood friend. In love with him. Raped by Hiro.

Chizuru Azuma — schoolgirl. Kind, persistent. Not afraid of Shun. Tries to be his "ray of humanity."

Kakeru Uruma — Shun's younger brother. Kind boy. Loved stray cats. In a coma.

Takashi Nogi — member of the "Revolution Club." Hot-tempered. Held Kakeru hostage.

Miguel — club member. Tall, muscular. Charismatic, but cruel.

Momoki — cult member. Participated in the Rock-Paper-Scissors game. Cut off Kaname's arm and leg.

Ganno — Ushiro's henchman. Enormous. Was supposed to Chizuru.

Karen Sakuraba — girl kidnapped by Ushiro. Later took revenge on him.

Kibe Jutaro — Noboru's comrade. Former Kitayama Squadron member. Created the "Neo-Kitayama Squadron."

Anzai Zenichi — police sergeant. Investigated the murder of Shun's parents. Did not want Shun to become a killer.

Kurusu — Andou's right hand. Quiet. Serial killer. Collected victims' hands.

Reo — adopted daughter of a cultist. Appears later. Helps Shun.