Saikyou no Yuusha Shibou, Parti Kaimetsu. Meikyuu Saioku kara Hajimaru Zetsubou Seikan-sen

Lucrecia, the mightiest hero, lost her life at the very depths of the labyrinth. Her party was wiped out, leaving only three survivors: a porter with no fighting ability, a brutish warrior who relied on the hero, and a beautiful young archer who abandoned her comrades. With both food and hope running low, they crawl upward toward the surface through the Labyrinth of Despair, where corpses and monsters writhe. This is the blood-soaked battle for survival fought by a group of defeated soldiers who had lost their hero.