The World's Strongest Rearguard: Labyrinth Country's Novice Seeker, Vol. 7 (manga‪)‬

After a tough battle, Arihito and his friends are celebrating their advancement to District Seven—when a distress call comes in from their rival party, Polaris! Georg’s group was last seen heading into the toughest labyrinth in District Eight, the Shrieking Wood…and Arihito’s party may be the only ones who can save them. They take the mission in a heartbeat, but when faced with the bone-chilling terror of the labyrinth and monsters that turn party members against one another, can they manage to not fall victim themselves?