After Wearing the Book, I Forced the Male Protagonist to Become a Yandere

Dressed as a cannon fodder female supporting character who met a miserable end, I bound the villain's survival system, and the hero and heroine had to be HE to survive. But every time I try to bring it together, the plot turns into a Shura scene. In order to save my life, I decided to attack the female protagonist myself. As a result, the male protagonist looked at me more and more strangely - his blackening value was full.