Kemutai Ane to Zurui Imouto

The manga's story centers on Jun and her younger sister Ran. The sisters lost contact with each other because of Ran's husband Ritsu, who was Jun's former lover. They meet again after eight years of not having any communication with each other, at their mother's funeral. The sisters become so conscious of each other, the three of them end up living together, and the gears of love start to slowly slip. (Source: Anime News Network)