Shiro Hinata is a popular seiyuu (voice actor/ actress) and actress in Japan. She lives with her older sister Ema Hinata. When she finally got a break from her career. She decided to enjoy her break with Ema. Until one day their father announces that he would be remarried. But to their surprise they're going to live at his fiancé's residence. Where they will start to live with their 13 new brothers!!! What will happen if one of the brothers will fall in love to one of them? There could be only one.