A black sphere known only as Gantz appears in a sealed room in the heart of Tokyo. People who died in accidents, murders, due to illness, or in tragedies wake up there without explanation, still wearing the clothes they had on at the moment of their death. There is no sky, no exit—only the heavy silence of the apartment and the feeling that something is watching everyone.

Then, the sphere opens.

A message appears on its surface:

“Your life is over. Now, it belongs to me.”

The game begins.

Players take on the roles of the dead, brought back by Gantz and forced to participate in missions against hidden creatures living among humans. Aliens, monsters, deformed entities, and impossible beings appear at various points across the city; each mission yields points that can mean survival, power... or a second chance at life.

Equipped with high-tech combat suits and futuristic weaponry—and armed with almost no information—participants must fight, cooperate, betray, flee, or sacrifice themselves to complete objectives before time runs out. Death within the game is brutal and, for most, final.

This Gantz RPG blends extreme action, horror, suspense, and psychological drama. There are no guaranteed heroes. The greatest danger isn't always the aliens, but the people trapped in the same room as you. Every decision could save a comrade, doom an innocent, or bring you closer to the 100-point mark—the number capable of changing your destiny.