During the summer vacation of my fourth year of college, I returned to my hometown for a week to look for a job. My mother, who lives at home, is currently living alone and has been raising me on her own since divorcing my father. I had never seen my mother as a woman until now... But one night, when I woke up to go to the bathroom, I suddenly heard some voices coming from my mother's room. When I looked in, I found my mother comforting herself. I couldn't forget that sight from the next day, and I finally lost my reason and crossed the line with my mother...