Bride of the Barrier Master, Vol. 2 (manga)

Hana has kept her recently emerged powers a secret from her condescending family.
However, the new head of the clan, the beautiful and powerful Saku Ichinomiya, makes Hana into his bride to help strengthen the barrier of a pillar that protects Japan. Now, Hana’s powers are being tested by Saku’s family, and she’s even met with harassment at school!