Eavesdrop on the System's Thoughts: Revenge Against the Magical Girl!

The night after my sister, a magical girl, died, a magical girl broke into my house and slaughtered my family. And there is a monster inside me that calls itself "the system". He disguised himself as a cold mechanical voice, but I could hear his heart. [This girl is so easy to deceive. She just gives me some crappy skills and is grateful. [If you fatten her up, you can take her body and be reborn. Me: "... Good system, no problem system." [Hey, why did she agree so happily today? [I always feel a chill on my back. I don't know what Kung Fu is or what cultivation is, but I know that he can make me take revenge!