Hirugao: Love Affairs in the Afternoon.

Life is simple for Sasamoto Sawa, a young housewife, but when the adulteress Takigawa Rikako moves into her neighborhood, so too does a new world of sophistication and sex. After Takigawa is nearly caught in the act, Sasamoto covers for her during the ensuing aftermath, unwittingly involving herself with a handsome teacher named Kitano Yuichi — and discovering her own desires for extramarital passions.