Story
When Hagihara Rito was seven years old, he sneaked out of the house in the middle of the night with his cousin, Ichijo Kei, and witnessed a fox wedding. The fox groom fell in love with Kei, and Rito was betrothed to the fox. From that night on, Rito also gained the ability to see supernatural phenomena...!? A story of a broken engagement between a boy betrothed to a fox and a boy who wants to cure his ability to see supernatural phenomena!
Synopsis via AniList (English).