Ema Hinata is a nice girl who only has her father as a family member. She finds out one day that he is remarrying Miwa Asahina, a rich fashion designer. Though she is relieved to have a new location to call home, the family she receives is more than she could have imagined—Ema now has 13 step-brothers! She moved into the Sunrise Residence, where her brothers reside, in order to give her father some room. As she settles in, Ema understands she may not have the loving camaraderie of a family that she has always desired, because many of her new brothers have sentiments for her that aren't merely familial. Will Ema be able to strive toward a happy ending with each brother vying for her attention in his own unique way?