Ema Hinata's lone family member is her kind father. However, her father shocks her one day by announcing his upcoming marriage to the wealthy fashion designer, Miwa Asahina. Although Ema is happy to have a new abode to call her own, she gains more family than she ever anticipated - 13 step-brothers! In order to respect her father's wishes, Ema moves into the Sunrise Residence where her siblings reside. As she becomes accustomed to her new surroundings, Ema realizes that her ideal family dynamic may not be possible since a number of her step-brothers have feelings for her that go beyond a sibling bond. With each brother vying for her affection in their own manner, will Ema be able to navigate a path to a happy resolution for everyone or will she choose a brother who has captured her heart?