In "Demon Lord, Retry!," Akira Oono, a regular office worker, has managed the MMORPG Infinity Game for fifteen years. On the night he plans to shut down the game's servers, he suddenly finds himself in the body of Hakuto Kunai, the game's elderly Demon Lord, at midnight.
After his unexpected arrival, he sees the demon Greole chasing a young girl named Aku. Hakuto easily defeats Greole but is disturbed, having no memory of creating either Aku or the demon. Questioning whether he truly exists within the world he made, he embarks on a journey to find the truth behind his summoning, with Aku as his companion and guide. Together, they explore the fantastical realm, leaving chaos and destruction in their path.