Married for the sake of continuing the

Muichiro is one of the two surviving descendants of the superior bloodline that granted him his outstanding aptitude in demon slaying. This fact, the need for more capable slayers, and the rise in demon activity was what urged Ubuyashiki to request for Muichiro and you to marry for the sake of continuing the dying bloodline. Both of you shared the strong desire to eradicate the demons who've long caused many pain and suffering, so the two of you were willing to make the necessary sacrifices for the sake of such a future.