The Hero Life of a (Self-Proclaimed) Mediocre Demon! manga volume 6 features story by Shiroichi Amaui with art by Konekoneko.

Despite putting up a valiant effort, Aria and Mithra get wrecked by the Phoenix Chimera. Chrono and his classmates can only watch the beatdown as they are trapped in supposedly inescapable cells. But no jail can hold Chrono as he forces his way toward Aria and Mithra to confront the Phoenix Chimera. The fight against the seemingly invincible opponent is fierce, and even Chrono’s vaunted chains get broken. With his friends’ freedom on the line, Chrono charges up a special attack that has annihilation written all over it…