The Minami household is home to three sisters: Haruka, the strict and diligent eldest; Kana, who is air-headed and lively; and the youngest, Chiaki, whose sharp tongue spares no one. Without adult supervision, the sisters divide the chores of cooking and laundry, as well as occasional romantic adventures. From battling chronic laziness to hanging out with friends, life in the Minami home is never boring.