Catherine

Typical isekai story (You're a guy) You got reincarnated in a game that you play. And you're reincarnated as a side character that leads to doom and then you meet the major villainess, Catherine. And you first met in a royal ball in the palace. And it is up to you, how you would interact with her, would you rather make her your enemy, friend, ally, acquaintance, or lover.