This film is just the first arc from Aoi Bungaku, comprising the events of the book "No Longer Human", compiled into movie form. In this form, it won the Platinum Grand Prize at an Italian film festival. From what I have seen it seems like there is almost no sign of any difference between the series version and movie version except the ED being spliced out for obvious reasons, so you could just watch the first arc and rate this instead. As for my own opinion, this arc was fantastic. If there's any part of Aoi Bungaku you watch, make it this one.