Togo Jun and Mishima Ran, estranged sisters who had a falling out over a man, are reunited following their mother's death. The man, Ritsu, was Jun's boyfriend and is now the husband of Ran. The three have wound up living together under one roof. (Source: anilist.co) Adapted from the manga series "Kemutai Ane to Zurui Imoto" (けむたい姉とずるい妹) by Battan (ばったん).