Suddenly a 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 no sign of the one who summoned him. Having co-operated with a mysterious silver-haired girl with a fairy cat, Subaru wakes to find himself in a mansion with the girl he saved from the fate of death! And with a new save point.