Kinki no Tensei Daimadoushi ~Munou kara Level Up de Saikyou ni~

Synopsis

Dungeons began appearing across the world, drawing people with awakened abilities into dangerous expeditions for money and hope. Saeki, who possesses no apparent skill, becomes an adventurer to fund treatment for his younger sister's incurable illness. Hidden beneath his reputation as an incapable novice is the memory of a past life as a supreme mage, and he must grow stronger to reclaim the power he once wielded.