Well I wanted to ask if there are movies out where hikikomori/shut-ins or maybe even SAD are mentioned. don't think there are lot of them out...
I know only two...
"Loner" - a korean horror movie about a girl who is a shut-in. well it's a good made horror.

"Hinokio" - japanese movie. a 12 years old boy who is a shut-in. he's guiding a robot which goes to the school. very warmhearted movie!!!!