500 years after the strongest demon lord was defeated by the heroine Mia, Al, the lowest adventurer, was tricked by the hero (a descendant of the hero Mia) and obtained a cursed sword. However, the sword caused Al to regain all the power and memories of the demon lord. As the reincarnation of the demon lord, Al embarks on a journey to eliminate the rotten heroes.

(Source: Akita Shoten, translated)