Miki Koishikawa dreamt of a simple family life, but that changes when her parents merge households with another couple, reshaping Miki's world. Amidst the chaos of living with four parents, including her charming stepbrother Yuu, Miki finds herself in a domestic drama. Juggling friends' romantic entanglements, school challenges, and a love triangle between her crush Ginta and stepbrother, Miki's life transforms into a captivating soap opera of its own.