なま夏 raw summer Ripped from the DVD. English soft subs; Japanese audio. http://www.imdb.com/title/tt1363477/
First-time director Keisuke Yoshida manages to make the businessman-stalker both monstrous and worthy of pity... combining the tone with creepiness and deadpan humor. --Andy Klein, City Beat. Raw Summer is the story of a man who sacrifices everything for a teenage girl who does not even know he exits. He follows her every move from the subway to her school to her home. He must be around her any chance he gets. The twisted innocent love devours his life. Winner 2006 17th Yubari International Fantastic Film Festival Off-Theater Competition Grand Prix. genre: depressing dark comedy-drama? stars: sora aoi, yutaka mishima 56 minutes.
Note: not any nudity that I can remember, but does contain disturbing situations since it deals with a stalker's fantasies.