Kūya Hiiragi, a young man with brown-orange spiky hair and amber eyes, stands at 175cm with a slim frame and pale complexion. Orphaned early in life, he was adopted by the Hiiragi family, becoming the sole brother to six older sisters. His adoptive father, wary of the sisters’ intense devotion and Kūya’s budding romantic attachment to second sister Kaname, relocated him to distant relatives for training. Years later, his return reignited intricate tensions within the household.

Known for his altruistic nature, Kūya gravitates toward domestic tasks, honing cooking skills that endeared him to his sisters, who previously struggled in the kitchen. Though gentle, he cultivates quiet resolve, spurred by a transformative moment when Kaname’s unsolicited advance drove him to strengthen his resolve and refine his abilities, seeking greater control over his life.

A sequel reveals Kūya’s post-training return to the Hiiragi estate, now trailed by two Inugami family sisters. Their presence swells his adoptive siblings to eight, intensifying emotional rivalries as he balances allegiances between both families. Conflicts deepen, testing his adaptability amid shifting affections and expectations.

Typically dressed in collared shirts and trousers, Kūya remains the non-biological nexus of fraught familial and romantic bonds. Narratives trace his evolving strategies to navigate the entangled desires of his sisters, emphasizing his growth amid relentless emotional demands.