"30,000 residents of the Northern Kelko plains were vaporized by the Kiyania bioweapon sprayed by the terrorist group Echiboza. 30,000 cats remained in their place. However, one person escaped this fate; a girl saved by a stranger with a gas mask.

Her name: Kaka Hollen."

In this strange new world, terrorism, crime, and corruption have found a new target in the feline kind. Enter counter-terrorism squad 'Green' and their all-purpose humanoid weapons, the 'OB's! But what role will Kaka play in midst of all this?