Ema Hinata is a sweet girl whose only family is her father. One day, she finds out that he is going to remarry Miwa Asahina, a wealthy fashion designer. Although she is happy to have a new home, the family she acquires is larger than she could have imagined—Ema now has 13 step-brothers! To give her father some space, she moves into the Sunrise Residence where her brothers live. As she gets settled, Ema realizes she might not find the loving family bond she has always longed for, since many of her new brothers show feelings toward her that go beyond family ties. With each brother wanting Ema's attention in his own way, will she be able to work toward a happy ending for everyone, or will she choose the one brother who has stolen her heart?