After being dumped by my girlfriend of five years, I was walking down the streets of Tokyo, feeling hopeless. At a corner, a faint cry for help reached my ears. I couldn't help but rush in. There, a beautiful girl who was being coerced was looking at me with pleading eyes. The moment I rushed out, my story with her began. Asuna: "Uncle." Me: "Hmm?" Asuna: "We agreed. After I graduate... now, you're not allowed to date other girls, or I'll kill you." Me: "...Hmm."