Musou no Kaitaishi

Dungeons have appeared globally, prompting people to become explorers in search of unique resources. Kurose Sakuto is among them, seeking an elixir to cure his childhood friend's terminal illness. After being informed by his friends that he is no longer part of their team, he continues his quest, encountering both demons and hostile individuals within the dungeons and in the outside world. Intense battles unfold across these settings.