Coming from a family plagued by poverty, Hajime Okano has assumed the responsibility of caretaker at a tender age. Despite lacking any remarkable qualities or even being considered substandard, she shoulders the additional duty of nurturing and supervising her five siblings who are all born at the same time. But when an illustrious music company comes knocking, Hajime, being the responsible elder sibling, strives even harder to juggle tending to her animated brood and pursuing her aspiration of becoming a part of the company's idols.