In the future, the Japanese government captures a class of ninth-grade students and forces them to kill each other under the revolutionary "Battle Royale" act.

With the Gyaos re-emerging, Gamera's ties to humanity have been severed with his bond to Asagi broken. Nagamine and Asagi investigate while an orphaned girl named Ayana discovers a new creature ...

Young Haru rescues a cat from being run over, but soon learns it's no ordinary feline; it happens to be the Prince of the Cats.