Synopsis: The Reincarnation of the Forbidden Archmage

One day, dungeons materialized out of nowhere and awakened persons embarked on a quest to uncover the treasures hidden within. Unfortunately, the protagonist, Saeki, lacked any skills and was deemed insignificant. Nevertheless, he chooses to become an adventurer anyway to afford the treatment for his younger sister's fatal illness. However, Saeki harbors a secret – he was the world's most powerful mage in his past life, and he must now progress through levels to regain his abilities. Follow the story of a seemingly incompetent individual who will revolutionize the world with his increasing strength!