After a nuclear disaster, the contaminated water has created these deadly monsters in the sea.

They then sought land where the human civilization was nearly decimated. They then turned on each other in a monster war like no other. Only the fastest and strongest shall win! Kaiju is a fun party game in which players are the monsters in battle, and they roll a die and have to perform the action as quickly as possible. The slowest person gets a wound which is drawn on by the crayon marker, and the one who gets six wounds is out.

The box is also part of the components and is used during the game. Kaiju comes with two sets of rules, one for the main game and another for a mini game.