The World's Strongest Rearguard: Labyrinth Country's Novice Seeker, Vol. 5 (manga) by Rikizo

Arihito, who had a chance encounter with the secret god Ariadne, was ranked first in the eighth district. The group is about to take the promotion exam to challenge the seventh district, but monsters overflowing from the labyrinth attack the city...!
Binding: Paperback / softback