The Red Love Letter

Synopsis

Yuuka-san is a writer who has an unhappy marriage. She cannot bear a child and therefore her husband has mistresses. One day, she meets her sister-in-law Kaoru and falls in love with her. After realizing Yuuka's feelings, Kaoru too, shows affection and they decide to live together after Yuuka bears her child and divorce her husband. (Source: Heterophobia Fansub)