Ayamachi no Mitsuai ~Otto ni Ienai Chichi to no Inkou~ by Appetite - Adult Sex Game

Seijiro Sakazaki lost his wife a year ago and has been living alone ever since.
However, his son and daughter-in-law, who could not bear to see him in such a situation, invited him to live with them.
One day, his son Haruhito decides to go abroad on his own on a mission, and they are left alone - Seijiro and his son's daughter-in-law, Asuna.
He feels her subtly, even though she is his son's wife, and senses something in Asuna's gaze, but a strange atmosphere remains between them, and they continue to live the life of parent and , who at first glance are good friends.