Bride of the Barrier Master, Vol. 1 (manga)

Hana Ichise is from a branch family to one of five barrier-weaving magical clans who protect and support Japan. But in the eyes of her mother and father, she's an afterthought compared to her talented older twin sister. When Hana's true potential awakens at age fifteen, she decides to keep her newfound abilities a secret-including from her parents-so she can have a quiet life. But the powerful new head of the elite Ichinomiya clan, Saku Ichinomiya, is looking for a bride...and he has his eyes on Hana!