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Shizuko has an affair with her childhood friend Ken, who reunited at the alumni association for five years after getting married. Ken became interested in Shizuko's big ass every time he piled up his body several times, but Shizuko stubbornly refused anal sex. One day, Fujiko, a classmate, finds out about her affair. Fujiko, who is also frustrated, summons Ken and falls asleep from Shizuko with her proud anal. The relationship between the three people, who are becoming muddy, will have a spectacular ending on September 9th, "Kiku no Sekku no Hi".