This is a tool-assisted speedrun, made on an emulator, using frame-by-frame shooting, savestates, and rerecords to overcome reaction time and human error. As such, it is purely a form of entertainment, and is not designed to show skill.
This is the story of Simon Belmont's horrible weekend without sleep.
The timeunit count for this movie is 3:15:11.
There are several items that are required for the completion of the game, and you can't buy them without killing a certain amount of monsters, thus this movie has quite much of running back and forth, collecting hearts.
There are a few very impressive glitches in this game - using them could cut the time down significantly. We will probably see a version utilizing them in the future.