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!
Due to Dark God’s wish, Uryu finds himself lost in a world where he has never met the three sisters and where he and Shirahi are boyfriend and girlfriend. However, having met Yae in the past, not all ties with the Amagami sisters are lost!! As he works with the three sisters to try and return to his original world, Shirahi visits Amagami Shrine and the whole truth is revealed...! The Dark God shows Uryu two paths he can take, two worlds connected by fate. Will Uryu return to his original world or choose to stay in his current one?!!