Young assassins Azumi and Nagara continue their mission to prevent a civil war. In their hunt for Masayuki Sanada, who is protected by both an army and a dangerous clan, they meet Ginkaku, a person who shows a remarking resemblance with former friend Nachi.

"Could you kill your best friend?" In future Japan, the government capture a class of ninth-grade students and force them to kill each other under the revolutionary "Battle Royale" act.