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

Eighteen-year-old Hana, born to a branch family of a clan of guardians, has always been stuck in the shadow of her more capable, beautiful, and popular twin sister. When a strong power awakens within Hana, she chooses to hide it so she can continue living a quiet life out of the spotlight. But that ideal lifestyle begins to slip out of reach when Saku Ichinomiya takes over as the new head of the Ichinomiya clan and sets out to find a bride strong enough to stand by his side!