Charts the troubled teenage years of students Yūichi Hasumi and Shūsuke Hoshino, exploring the shifting and complex power dynamics of their relationship against the backdrop of Yūichi's love for the dreamy and abstract music of fictional pop star Lily Chou-Chou.
In the future, the Japanese government captures a class of ninth-grade students and forces them to kill each other under the revolutionary "Battle Royale" act.