In a post-apocalyptic future where the survivors have banded together into ninja clans, representatives of the Lost Ninja Clan – brothers Cage and Surge, deaf-mute Sky, Trillion, and Mar – are called to an underground bunker to attend a peace conference. Each of the ninja clans has a magic power, and the Lost Ninja Clan control electricity. Fumitaka, a respected clan leader, believes that the disparate ninja clans are under threat by an external force. He proposes that they band together to increase their chances of survival. Though this is well received by the assembled clans, he is assassinated at the end of his speech. Three witnesses step forward to identify Cage, the leader of the Lost Ninja Clan, as the assassin. Confused and protesting his innocence, Cage leads his clan to safety as they fight through the hostile crowd. Cage uses most of his magical power reserves to temporarily knock most of the other ninja unconscious.