To the Unfaithful Older Sister. ~Revenge from the Younger Sister and Ex-Boyfriend~

I, Toyama, was told by my girlfriend, with whom I had been dating, that she wanted to break up because our relationship was half-hearted. Then her younger sister confessed to me like this: "My older sister is with another man outside." In that way. I was shown several pieces of photographic evidence.....how do I put it. A feeling of revenge welled up in me. And so we began to move. With the feeling that we would reset everything.