Kimi to Ita Mirai no Tame ni

At very end 1999, Atsushi Horigami, 22, has heart failure & dies. Instantly, he awakens in his own room - in 1995! He's 18 with all memories up until his "death" in 1999 intact. Trapped in a never-ending loop, Atsushi is forced to re-live the same four-year period over & over but things can & do vary, by his own actions and randomly. Meets two others in same fix, one of whom has decided to take advantage of his knowledge of the future without any scruple, worse he is a clever sod. (imdb)