Kono Otoko, Yuuryou Bukken ni Tsuki: Kurekure Imouto ga Watashi no Subete wo Ubatte Kimasu

Azusa is a newlywed, married for six months to her husband Sogo, who works at a major company. Her blissful life is shattered when her stepsister Erika moves in. Using her feminine wiles, Erika systematically steals everything from Azusa: her husband, her home, and her peace of mind. Azusa loses everything and is taken in by her cold but capable boss, Nanase, a man she used to be wary of. This begins her story of revenge and new love as she fights to reclaim her life from the sister who has always taken everything from her.

(Source: Beaglee, translated)