He's lazy, arrogant, and a total scumbag, but his potential is the strongest in the world?! One day, the protagonist reincarnates as "Shin Darkside", a villain noble from a game he was super into. A life full of ruin flags drives the protagonist into despair, but it turns out Shin has the cheat skill [Gluttonous Demon King], a mighty power which lets him devour other's magic and skills to turn them into his own! "If I train this skill to break its limit, maybe I can escape these ruin flags?" With the knowledge of the original story from his past life and the Gluttony Demon King skill, Shin tries to defy his doomed future! Without realizing it, he starts acting like a main character... and before long, cute heroines from the original story and powerful allies who admire the former tyrant Lord Shin start gathering at his side...?!