Strange & Mystifying Story GN Vol 04 (MR)

Thanks to his grandmother's trickery, high school student Tsumugi has been betrothed to Master Kurayori, the family's guardian deity. Although Kurayori is rather miffed over the deception, Tsumugi is serious about his relationship with the guardian deity and about saving his home. However, as the two spend more time together, nothing seems to change. What's an inexperienced high school student betrothed to a very reluctant fox spirit to do?