Nee-chan ni Zettai Koi shinai!

By some accident, En realizes that he is one of the love interests of an otome game. Moreover, the protagonist is his stepsister?! Is that why there's a dialogue box over our torsos?! And the reason I have 39 brothers?! Because it's all a game?!! The reason I like my stepsister is because of the system? The reason she is kind is because of the game?? "No way... I'll break the flags with all my power!" Can En resist the system?! **En (縁) means fate.