Ema Hinata is the daughter of the famous adventurer Rintarō Hinata. One day, Ema finds out that her dad is going to remarry with a successful apparel maker named Miwa Asahina. Rather than bothering them, she decides to move in to the Sunrise Residence complex that is owned by Miwa. From there, she discovers that she has 13 stepbrothers. As she gets to know all of them, will one of her step-brothers fall in love with Ema?
繪麻是一個普通的高中生，她的父親與心上人結婚，因為繼母擁有十三個兒子，所以繪麻突然成為家中唯一的女兒。這會讓原本平穩的兄弟生活產生什麼變化？