Tokio: Message Across Time(2004)

Has one person changed your life? A proud but lazy loser, Takumi dreams of getting rich as he gambles his girlfriend's money away. One day, he is rescued from a fight by a strange young man named Tokio. Tokio tells a weird story -- that he is Takumi's son from the future and has come to save his old man from a tragedy! Before this can sink in, Takumi's girlfriend disappears. Can they save her? Or will the future change for the worse?