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Fifteen years in one of the possible futures, a violent battle using fictional technology takes place between two "time-spaces": La'cryma, a possible future of our own universe, and Shangri'la, another possible dimension fifteen years after ours intent on the destruction of all space and time. The key to stopping Shangri'la's invasion is a mysterious object known as the "Dragon Torque" (竜のトルク, Ryū no Toruku). A group known as the "Dragon Knights" is sent through space and time to find it. In the present, twelve-year old Haruka and her friend Yū are contemplating running away from home when they meet a member of the Dragon Knights named Karasu, who is a possible Yū from fifteen years in the future. Karasu believes that Haruka is the Dragon Torque, but vows to protect her rather than sacrifice her for his timespace, La'cryma. Other than the Dragon Knights, Haruka is targeted by the mysterious Noein, the entity behind Shangri'la who is intent on bringing her into his timespace to end all universes.