京大医学部を目指す高校生の上終瓜生。児童養護施設育ちの瓜生は「甘神神社」の宮司さんに引き取られ、居候することに。受験勉強ができる環境があれば…と思っていたが、居候の条件は「婿養子として神社を継ぐ」こと!? しかも結婚相手は同居する巫女三姉妹!!一つ屋根の下、巫女と紡ぐ恋と奇跡の物語、開幕!!

Kamihate Uryuu, orphaned since childhood, receives an invitation to stay at the local Shinto shrine. All he wanted was a quiet place to study so that he can fulfill his dream of making it into a top medical school, but after arriving there, he comes across three beautiful shrine maiden sisters… and the head priest requests that he marry one of them and take over the shrine. A tale of love and miracles is about to unfold!