The Villain Lady Actually Called Me Onii-Chan

Oni-chan~ Ahhhhhhhh! Irrfan, who was reincarnated from a miserable engineer into a love adventure game, let out a high-pitched scream because his sister was so adorable. It's hard to imagine that my sister, who looked like an angel when she was young, would grow up to be a vicious heroine. [No, absolutely not like this! For the continuation of the family, to save the dog's life, and to keep the other person's angelic and lovely smile forever, Irfan silently made up his mind to cultivate his sister into a gentle lady.