I lost my father at an early age, and now I live with my mother (Maki). In order to enter the same university as his father, he has been studying with a private tutor, Mr. Sugiura, since this spring. He was smart, tall, and a good-looking college student...He was someone I admired, but when it came to talking about my mother, his demeanor suddenly changed, and I was scared that he looked at me like he was preying on me. She is a dangerous presence for me, who considers her mother to be a woman. Then, on her day off from her tutoring job, she witnesses her mother and Mr. Sugiura fixing her disheveled clothes...