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

Chapter 20: Transfer Ring and Me?!
Chapter 19: The Capture Targets and Me!?
Chapter 21: The Real Deal and Me?!
Chapter 19: The Capture Targets and Me!?
Chapter 21: The Real Deal 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.