Musou no Kaitaishi

Dungeons have inexplicably materialized across the globe, transforming ordinary people into explorers who brave their treacherous depths to harvest rare and invaluable resources. Among them is Kurose Sakuto, a dedicated adventurer driven by a desperate personal mission. His childhood friend is afflicted with a terminal illness, and his sole objective is to uncover a legendary elixir hidden within these subterranean labyrinths—a miraculous cure capable of saving her life. However, his quest takes a devastating turn when his own party abruptly delivers an expulsion notice, stripping him of his team membership and leaving him isolated. Cast out by those he trusted, Sakuto is forced to navigate a world where peril extends far beyond monstrous threats. He must now contend not only with the deadly demons lurking in the dungeon's shadows but also with the malice and betrayal of corrupt humans in the real world. With no allies left to rely on, Sakuto stands alone against overwhelming odds. This gripping otherworldly battle action chronicles his relentless struggle for survival as he fights through both supernatural horrors and human treachery to secure the one prize that matters.