Welcome to the N.H.K. (2006 - 2006)

The Japanese animated series "Welcome to the N.H.K." tells the story of Tatsuhiro Sato, a young Japanese hikikomori who, with the help of a mysterious girl named Misaki, wants to overcome his problem. One day, Misaki herself appeared at Sato's doorstep. She already knew a lot about his problems, as well as about the NHK organization, which, according to Tatsuhiro's belief, is involved in a global conspiracy to turn people into hikikomori. Sato tries to convince Misaki that this story is not a figment of his imagination.