Tsumetai onna: Yami ni hibiku yogarigoe (2018)

The relationship between Maakoand her husband Michio, who runs a printing company, has become cold. Maako repeatedly visits the home of novelist Makoto and has an affair with him, and he frequently tells her to get a divorce, but she hesitates, thinking that Michio's financial situation means he can't even pay alimony. Meanwhile, while passionately making love to Makoto, Maako makes a terrifying proposal to him: kill Michio and get the insurance money... She thought it would be easy with Makoto, a mystery writer, but...