Hunted by the Ming from China, young Kotaro and his dog meet a nameless samurai “Nanashi” who is haunted constantly by memories of his past which has led him to avoid drawing his sword ever again. Among the Ming is a fearsome Western fighter named Raro, whose only desire is to find a worthy opponent.

Youngsters called Kildren, who are destined to live eternally in their adolescence. The Kildren are conscious that every day could be the last, because they fight a war as entertainment, organized and operated by adults. But as they embrace the reality they are faced with, they live their day-to-day lives to the full.