The World's Strongest Rearguard: Labyrinth Country's Novice Seeker Vol. 2 (manga)

Having formed a party and found companions he can explore the world with, Arihito is finally settling into his new normal as a Seeker in the Labyrinth Country. But when a girl goes missing, he's soon plunged deeper into the dungeon than his party is prepared to handle...Despite joining up with "Death Sword" Elitia and Shrine Maiden Suzuna, Arihito and his team may be in way over their heads!