High school student Subaru Natsuki, returning from a konbini, is suddenly transported to a strange world. Could it be one of the parallel worlds that we talk about so much in video games?! When Subaru is attacked by a group of bandits, risking his life, his savior arrives, a beautiful silver-haired girl with a cat-like spirit at her side. Under the pretext of returning the favor, Subaru decides to help her recover what she is looking for. But, just when they finally find a clue, the two are attacked by a stranger and lose their lives. Or not... Subaru discovers, in fact, that he is in possession of a unique and extraordinary power, the "Return from Death". Will he be able to save his heroine?