Upon arrival, Ganta is fitted with a lethal collar. This collar serves two purposes: tracking and tracking inmates while causing them intense pain if they break rules.

Without warning, a mysterious, cloaked figure with inhuman abilities—referred to as the "Red Man"—appears outside the classroom window and slaughters everyone in the room except for Ganta.

Ganta also meets Yoh Takami, an inmate who acts friendly but is actually acting as a spy, hoarding Cast Points for his own goals. 5. Discovery of the "Branch of Sin"

The first episode is a relentless introduction to a world of despair and brutal competition, moving quickly from a peaceful setting to extreme violence. It sets up the central mystery of the Red Man, Ganta’s desire for vengeance, and his new life as both a victim and a dangerous "Deadman" inside the prison. If you want to dive deeper, I can tell you about:

The first episode of Deadman Wonderland , titled "Welcome to the Suck" (or "Death Row Inmate" in some translations), sets a brutal and chaotic tone for the series. It immediately establishes a high-stakes survival horror atmosphere, introducing the protagonist Ganta Igarashi, who is framed for the horrific murder of his entire class.