Ema Asahina moves into the Sunrise Residence and gains thirteen stepbrothers overnight. Among them are the twenty-three-year-old twin voice actors Tsubaki Asahina and Azusa Asahina, who share a close, playful bond. This manga retells the events of the main Brothers Conflict story entirely from Tsubaki and Azusa’s perspective, following their reactions as their new stepsister enters their lives and the household dynamic shifts.

The story alternates between the twins’ viewpoints. In the Tsubaki Edition, he takes pleasure in teasing both Ema and Azusa, but his lighthearted demeanor gives way to genuine romantic feelings as he spends more time with her. The Azusa Edition shows a quieter, more introspective side: Azusa is conflicted by the attraction he feels toward Ema and initially tries to deny or suppress it, fearing it will disrupt the equilibrium he shares with his brother. As both twins acknowledge their growing affection, the secure brotherly relationship between Tsubaki and Azusa becomes strained. A key narrative arc involves a hospital scare when Azusa is hospitalized, forcing Tsubaki to reconsider his actions. This leads to an emotional reconciliation where the twins accept each other’s feelings for Ema, reaffirming their bond while also becoming open rivals for her attention.

The setting remains the bustling Asahina household, with other brothers and Ema’s squirrel familiar Juli appearing in the background. The manga weaves together romantic comedy, moments of jealousy, and the underlying tension of two siblings navigating their competing desires without losing their connection. The story culminates in the twins reaching a mutual understanding that preserves their brotherhood while embracing the competition for Ema’s heart.