The story delves into the world of secondary education, where teacher Sakurai Makoto faces his greatest challenge: Ayase Miki, a gyaru whose reputation precedes any attempt at discipline. Known for her unruly behavior and perpetual risk of failing a grade, Miki is an enigma Sakurai can't decipher. All his teaching methods, from reprimands to tutoring, have run up against a wall of indifference and defiance. Convinced that the root of the problem lies at home, Sakurai decides to take the final step: a home visit he hopes will be the key to solving the case of his impossible student.
However, the door that opens doesn't reveal a nest of family problems, but rather a stage for female competitiveness. The one who answers is Minami, Miki's mother, a woman whose mature beauty and spectacular figure belie any notion of conventional parenting. Sakurai's visit, which should be a serious intervention, immediately becomes the catalyst for a strange game. Neither mother nor daughter takes the teacher's authority seriously. On the contrary, his presence seems to ignite a latent rivalry. In front of him, they begin a playful yet intense competition, a battle of charms where each flaunts her body, comparing and contrasting her attributes with a boldness that leaves Sakurai as a mere spectator. The situation he believed to be a problem to be solved reveals itself as a much more complex and disturbing family dynamic, where the line between maternal concern and flirtatious rivalry has been completely erased, leaving him trapped at the epicenter of a duel of the sexes that has nothing to do with his pedagogical intentions.