Subaru's first day in Roswaal's mansion begins for the fifth time. Determined to save everyone this time, he makes it a point to keep his best smile on his face in order to earn the trust of the mansion's staff. But although he works his hardest to make them like him, his body begins to have trouble keeping up with his heart's intentions. Soon Emilia is unable to bear the sight of him struggling any longer and takes an unexpected action...

Suddenly, high school student Subaru Natsuki has been summoned to another world on the way back from the convenience store. With the biggest crisis of his life being summoned to another world, and with no sign of the one who summoned him, things become even worse when he is attacked. But when he is saved by a mysterious, silver-haired girl with a fairy cat, Subaru cooperates with her to return the favor. When they finally manage to get a clue, Subaru and the girl are attacked and killed by someone. Subaru then awakens in the place he was summoned and notices he gained the ability "Returns by Death" and has become a helpless boy that only has the ability to rewind time by dying. Beyond the despair, can he save the girl from the fate of death?