Ema Hinata moves into the Sunrise Residence complex after her father remarries a successful clothing designer named Miwa Asahina, hoping to give the newlyweds space. She soon discovers that she has thirteen stepbrothers living in the same building, each with a distinct personality and career. Ema wants nothing more than to build a peaceful, loving family with them, but her sudden presence in an all-male household stirs up trouble. The brothers begin to develop romantic feelings for her, and a quiet competition to win her heart takes shape, creating tension beneath the surface of everyday life.

The Brothers Conflict Anthology is a two-volume collection of short stories that expand on these dynamics. Each volume brings together multiple mangaka who contribute self-contained episodes focusing on different brothers. The first volume, Perfect Pink, centers on Kaname, Hikaru, Tsubaki, Natsume, Louis, Subaru, and Wataru. The second volume, Beloved Blue, shifts the spotlight to Iori, Futo, Masaomi, Azusa, Yusuke, Ukyo, and Juli. The anthology does not follow a single overarching plot; instead, it offers a series of vignettes that explore individual relationships, quiet moments, and the distinct ways each brother interacts with Ema. The stories range from lighthearted daily encounters to more emotionally charged scenes, all set within the familiar setting of the Sunrise Residence and the larger Asahina family world. The collection provides a broader view of the romantic and familial conflict that defines the series, with each short story highlighting a different facet of the brothers' feelings and the complicated household Ema has stepped into.