Yokujô mesu: Midare shibuki (2002)

Mayumi had recently given birth and was living a peaceful, ordinary life with her husband, Hidetoshi. Then, her older sister Eiko showed up from the countryside and moved in. Eiko, whose personality was the polar opposite of Mayumi’s, was free-spirited and did exactly as she pleased. Although Mayumi found her sister a nuisance, Eiko got wind of a secret from her past—that she had once appeared in adult videos...