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?!