Under Ninja, Volume 7

It's all out ninja war in Nerima City! And ground zero is Kodan High. The Under Ninja have begun to slaughter the ninja students there without any remorse for the civilian student body. And while there is chaos on campus, Kurou is out at Yankii High taking on one of Kodan's UN "spies." Why is this happening now? And how are a cat and a motorcycle talking to each other...?