Transferred to another world, but I'm saving the world of an Otome game!?

Chapter 11: The Villainess’s Scheme and me?!
Chapter 10: The Villainess and Me?!
Chapter 12: The Villainess's Marriage Interview and Me?!
Chapter 10: The Villainess and Me?!
Chapter 12: The Villainess's Marriage Interview and Me?!
A two-part one-shot about a guy accidentally transported to an Otome game by his sister. To get out, he needs to clear a love route, but he tries his best to find another way.