Into the Deepest, Most Unknowable Dungeon manga volume 9 features story and art by Kakeru.

Jean and his party traverse the Untraveled Lands and make an immense discovery! Sei puts her strength to the test in a mock battle against her friends to prepare for the Holy War! In the lands of the demi-humans, the breeding pens are filling up. With no magic and no cheats, Jean has only his allies and his indomitable will—can he get strong enough, fast enough, to fight back against an entire country of monsters?!