Couldn't find a thread about this excellent show so I'll just make one myself!
Welcome to the N.H.K. is an anime and a manga based on a light novel by Tatsuhiko Takimoto. The anime was released in 2006 by Gonzo.
It's about a 22 year old hikikomori who lives in his apartment, receiving money from his parents. He sleeps 16 hours a day and has a neighbour who plays the OP from a bishoujo anime non-stop, which drives him insane. He's paranoid and thinks an organization called Nihon Hikikomori Kyōkai (N.H.K.) is responsible for all of this. One day he decides to get a job in a manga store where he meets a cute girl. The story deals with depression, friendship and addiction (during a 2-episode filler arc) to name a few things. I won't spoil anything else. Go watch it. It's depressing and disturbing at times, but it's worth your time.
Discuss.