Bride of the Barrier Master, Vol. 4 (Manga): Volume 4 -

Hana is approached by Sae, her old servant from the Ichise home, with a desperate plea to save Hazuki from the fate their parents have forced upon her. Ever since Hana left the family, her relationship with her twin has been frayed--and getting involved could mean sacrificing her new life of freedom. But when a crisis erupts at school, they might have no choice but to work together! Will Hana and Hazuki be able to rekindle their sisterly bond?