My mother was my sex practice partner. I broke up with my girlfriend because the sex with my mother was too good, so I was crazy about it and came inside her over and over again. Kanako Hamabe

The movie depicts an incestuous relationship between a son and his mother, where the mother takes on a sexual educational role, teaching her son about intimacy and physical pleasure. The story explores the complexities and taboos surrounding such a relationship, as the son navigates his feelings and desires under his mother's guidance. As the title suggests, the son's experience with his mother leads him to break up with his girlfriend, indicating a deep emotional and physical connection with his mother.