The scene unfolding before my eyes was shockingly unbelievable. My friend Yusaku was engaging in inappropriate acts with my own mother. Mesmerized by the sight, I found myself unconsciously spying on them. I called out to Yusaku right there. "Isn't this wrong? How can you do such things with your real mother?" But Yusaku calmly replied, "I never thought you'd see us, Atsuro. Hey, why don't you record my relationship with Mom on video? And then, my relationship with my sister Yuki too..." With those words, I was pulled deeper into an increasingly twisted and abnormal world.