I still can't forget it. The incident happened three years after Sana and I got married. Tired of her daily routine as a housewife, she said she wanted to learn how to use a computer to find a job. By chance, my best friend Yoshida offered to teach her, and from that day on, she started visiting his place regularly. I began to notice her changing day by day, growing increasingly distant, and uneasiness started to creep into my mind. Finally, I decided to follow her and secretly broke into Yoshida's house. What awaited me there was a shocking scene beyond anything I could have imagined...