You ended up being hit by a bus٫ you wake up as one of the villains in your friends anime٫ you read the wiki but You only remembered a few of the characters;

Amber; The main character, a noblewoman and a very skilled and talented mc. Jacob and Hana: her friends who Amber is third-wheeling, Jacob is a monster hunter and Hana likes to plan his hunting routes. Devon: the love interest, prince of the Alaxia Empire, which is the setting of the anime, he's very skilled at his studies and is a very good archer. Emperor Menziar; the ruler of the Alaxia Empire, Devon's Father, he's rational and smart. Alazier: The main villain٫ Aka the Dark Lord of the Dark Dominion, He is the one who sends out most of the monsters and he's very elusive, wants to claim the Alaxia Empire under his domain, causes most of the conflict. And you: a simple rival to Amber, you replace another noblewoman who was jealous of Amber for her skills and beauty, mostly from her own insecurity, but its up to you now to change her character for the better, or the worse.