I become an Emperor of a dooming kingdom

Dew, a guy, famous in his college for his indifferent attitude, has a huge sister complex. Marie, a high school girl deeply invested in the novel she recently started reading ignored her brother like an air.

"Marie, open the door, are you crying inside? what happen? Did some bastard bully you? Open the door Marie!" A big brother worried for his sister who has been holed up in her room most of the time and now she is even crying.

"What are you shouting for?" A loud cry along with a bang sound entered Dew's ear, he saw his sister carrying a book, her swelled eyes due to crying so much.

After an hour of explanation, Dew understood the situation and he had taken that book from his sister to finish it in one sitting but unknown to him he never had a chance to rewrite the book for his sister with a better ending.

The next moment, Dew saw himself in the body of the very man who had brought the bad ending for his kingdom, An Emperor!.

He focused on his mission by saving the dooming kingdom but why the people around him seems to be somewhat different from what he read especially that ruthless Duke who was infamous for his twisted ways of killing people.