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?