The World's Strongest Rearguard: Labyrinth Country's Novice Seeker, Vol. 4 (light novel)

"Arihito and his party are making tremendous progress towards District Six when the unthinkable happens: a Named Monster attacks the top-ranked alliance Beyond Liberty and steals their leader's soul! Only Arihito's group is capable of defeating this creature and saving the leader's life...but what path will they take now that this rival alliance no longer stands in their way?"--Publisher's description.