One day, I ended up having the game's villainess as my younger sister.

Her name is Amelia Dayashi. In the original work, she was the one who murdered her older brother.

So I did everything I could to twist the worldline—but from some point on, the sense of distance between us has become way too close.

"Brother, aren't you going to give me a reward today?"

……You actually became a good kid, right?