Failure Frame: I Became the Strongest and Annihilated Everything With Low-Level Spells manga volume 10.

Using skills many consider “worthless,” Touka and his group, the Lord of the Flies Brigade, cut their way through hordes of fearsome monsters in the Land of the Golden-Eyed Monsters. They finally reach their destination: the domain of the Forbidden Witch. Though the witch invites them into her home, it remains to be seen if she's an ally. Meanwhile, the Demon King's army begins its invasion of the human world, and the heroes of 2-C join the fight to push them back. It's only a matter of time before Touka and his team join the fray!