a son who hates studying and is a ronin (a student who failed to enter university). he enjoys taking pictures, but he doesn't go in that direction, and his mother was at her wit's end. at that time, she remembered her friend chisato, who used to be a tutor. chisato happily accepted and agreed to be the son's tutor. chisato said that if he worked hard, she would give him a reward, and his grades gradually began to improve. the son, who had reached his goal, asked chisato to take his picture. chisato reluctantly agreed, and the photo shoot began. while taking pictures, the excited son took off his clothes and showed chisato his erect crotch and made her hold it. chisato was bewildered by the sudden event, but she ended up taking the son's crotch as she was told...