Watashi no Aishita Haha no Koibito

The night my mother's funeral was over, I had relations with her lover--. After her mother passed away, Chigusa returned to her parents' home for the first time in 13 years. There, she finds a man who used to be her mother's lover living there! Chigusa is confused by his grief over the loss of the love of her life, but she reaches out to him...? A mysterious life together, where various kinds of "love" intersect!