Uryu Kamihate has had a rough start to life, but plans to forget it all by achieving his dream-matriculating into medical school. But when he arrives at his new foster home, a working shrine, his dream of a quiet place to study goes up in smoke. Not only will he be living with the three beautiful, lively Amagami sisters-but he learns that he must marry one of them and take over the shrine!
With only a week to go until New Year’s, Uryu leaves Amagami Shrine to spend a few days at Kiseki-En Foster Home for some intensive study. But while there, he gets some strange texts from Yuna…and when he rushes back to the Shrine to investigate, he finds a little girl in her place! And in exchange, the present-day Yuna finds herself at the Amagami Shrine of ten years ago…face-to-face with her deceased mother! In the world within the mirror, she must face her past and herself in order to make the connections that will last into the future…