One week before the final exam, Fujimaki was at a loose end. That’s because his girlfriend had gone to a study camp with her club members. As he was about to head home alone, he happened to encounter Satomi Kawai. Satomi was someone with whom he had an intimate relationship while seeking advice about his girlfriend. Satomi, who was likely to fail her test, invited Fujimaki to her house for him to teach her. However, Satomi, a born lover of intimacy, would rather spend time on such activities than studying. The following day, he ends up talking to Satomi’s mother until Satomi returns from her part-time job. The mother, who was prone to physical contact and excessive affection, resembled Satomi. Fujimaki was excited by the mother’s close contact and good figure. And so, she, as thanks for teaching her daughter, would expose her chest as a form of temptation.