Hana Ichise belongs to a branch family of one of five clans whose barrier magic has guarded Japan for generations. Her parents have always favored her gifted twin sister, Hazuki, leaving Hana in the background. When a strong power finally awakens in her at fifteen, she keeps it hidden, even from her parents, hoping to finish high school and live quietly. That plan grows harder to keep when Saku Ichinomiya becomes the new head of the elite Ichinomiya clan and begins searching for a bride strong enough to stand beside him. Saku sets his sights on Hana and presses her toward a marriage contract. Hana has to weigh her secret against the offer, and ask whether a peaceful future is still within reach. Drama, fantasy and romance come together in her story.