After Passing Through the Book, I Must Be the Yandere Male Protagonist

After dressing up as the male protagonist's cannon fodder, I decided to strike preemptively. When the heroine and I were kidnapped at the same time and asked to choose one of the two, we decisively jumped into the sea and escaped. "I know you love her, I will help you!" Unexpectedly, the male protagonist was so guilty that he went crazy and guarded my tomb to repent every night. Until one day, he received a package with the wrong address. That night, I was caught by him in all sorts of ways. His eyes were scarlet, the chain in his hand was shining coldly, but his tone was full of humble supplication. "Honey, I only love you, please don't leave me, okay? I can play any game with you."