Onna-zakari: Shiroku nureta futomomo

女ざかり 白く濡れた太股 (original title)

Synopsis

After his mother's 49th day memorial service, graduate student Kazuo decides to spend the night at her villa, where he becomes interested in Eri, the widow next door. However, it turns out that the person Kazuo really loves is Eri's daughter, Rika...