The Hero Life of a (Self-Proclaimed) Mediocre Demon! manga volume 5 features story by Shiroichi Amaui with art by Konekoneko.

The twin heavenly dragons, Mithra and Alia, have been enjoying themselves immensely in the brief time they’ve been in Chrono’s class. However, their fun times as a students in the Demon King’s Castle is nearing an end as they must fulfill a contract that requires them to conquer a supremely difficult dungeon. Despite wielding extraordinary power as heavenly dragons, the twins seemingly have no chance of conquering the dungeon until Chrono and his classmates offer a helping hand. Will a group effort be enough to overcome a dungeon that crushed two heavenly dragons?

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…

The Hero Life of a (Self-Proclaimed) Mediocre Demon! manga volume 7 features story by Shiroichi Amaui with art by Konekoneko.

The search for items to release Chrono's domination contract continues in the eleventh Demon King's dungeon, located at the bottom of the ocean. Chrono's group manages to secure an important treasure, but soon find themselves in tentacular trouble! A kraken with the ability to perfectly camouflage itself attacks, intent on keeping the treasure out of Chrono's hands. Underwater and blind to his enemy, Chrono will need to rely on more than his enormous strength, but what else does he have?!