I Possessed the Underdog Who Awakens to Darkness and Gets Beaten up by the Protagonist, but I’m Confused Because It’s Too Different from the Original Work

The villainous noble, Zenon Restinata, is a disappointing "underdog" who gets beaten up by the protagonist in the original anime. "I," a mere fan of the original work, have possessed such a Zenon!? This place is completely the world of the anime, and when I tried out magic for starters, it was super fun. I've decided-- I'm going to change Zenon's disappointing ending! The "do-over" life of a magic maniac begins!!