KASUMI had more than a hundred partners during her sexually adventurous college years, but after entering the workforce she devoted herself entirely to her serious boyfriend, a supervisor at her company. They dated for three years and married last year. On their first-anniversary trip to a hot-spring town in Yamanashi, she runs into former college classmates—the men from the sex club she once belonged to. She insists she never wanted to see them again and vows not to give in, but old memories slowly return. Her husband then witnesses the entire night as the two men wear down her resistance in a threesome until she finally surrenders to their huge cocks.