All Miki Koishikawa desired was a normal family, and that is precisely what she possessed until her parents chose to move in with another couple, turning Miki's world upside down. She now resides in a home with four parents and her utterly adorable stepbrother, Yuu. It is bad enough being drawn into her parents' bizarre soap opera, but Miki will star in a drama of her own as she navigates friends having affairs, attempts to survive school, and finds herself torn between her longtime crush, Ginta, and her new stepbrother!