Kinki no Tensei Daimadoushi

Kinki no Tensei Daimadoushi summary: One day, dungeons suddenly appeared. Humans with awakened skills then set out to face these dungeons in search of hope and riches. Our protagonist, Saeki, having no skills, is considered incompetent; in order to earn enough money for the treatment of his little sister with an incurable disease, he decided to become an adventurer.