Watashi no Aishita Haha no Koibito

On the night of my mother's funeral, I had relations with her lover... Chigusa returns home for the first time in 13 years upon receiving the news of her mother's death. She finds a man who used to be her "mother's lover" living in her parents' house! Chigusa is confused, but reaches out her hand to him as she grieves the loss of her beloved...? A mysterious life together, where various kinds of "love" intersect! Note: Chapter count includes one extra.