English director Laurence Thrush and executive producer Takao Saiki released "Tobira no Muko" (Left handed) back in 2009 and the film now is due for an official release in Japan. The film stars a former hikikomori who attended Apple Tree school in Saitama prefecture for troubled youth unwilling or unable to attend school. The film depicts the main character's descent into social withdrawal and the various factors that contribute to his state as a hikikomori.
You can read about the film in greater detail on the English website for the film: Tobira no Muko
And here is a subtitled Youtube trailer for the film: