Welcome to the N.H.K.

is a Japanese novel written by Tatsuhiko Takimoto, with a cover illustration by Yoshitoshi ABe, and was published by Kadokawa Shoten in Japan on January 28, 2002. The novel was first published in English by Tokyopop on October 9, 2007. The story centers around a twenty-two-year-old hikikomori who gets aid from a strange girl who seems to know a lot about him, despite never meeting him before. A common theme throughout the story deals with the hardships of life and how people must deal with them in their own way.

Welcome to the N.H.K. was adapted into a manga series, also written by Takimoto, with art by Kendi Oiwa. The manga was serialized between June 2004 and June 2007 in Kadokawa Shoten's manga magazine Shōnen Ace. The manga's forty chapters have been collected into eight bound volumes released in Japan and overseas. The English edition of the manga is published by Tokyopop, and the first volume was released in October 2006. The novel was also adapted into a twenty-four-episode anime television series by Gonzo which aired in Japan between July and December 2006. ADV Films announced at Anime Central that they acquired the English rights to the anime, and they released DVD volume one in October 2007 with volume two released in December 2007. In 2008, the anime became one of over thirty ADV titles acquired by Funimation Entertainment.

In Japan, "NHK" refers to the public broadcaster Nippon Hōsō Kyōkai, but within the series, the main character believes it stands for, which is a reference to the protagonist's claim of a subversive conspiracy led by NHK (the real-life broadcaster) to create hikikomori. While it mainly deals with the reclusive phenomenon of hikikomori, the plot also explores many other Japanese subcultures—for example: otaku, lolicon, and internet suicide. Despite the show's name, Welcome to the N.H.K. was not broadcast on the NHK television channels, but it was syndicated throughout Japan, from July 9, 2006 to December 23, 2006, with Chiba TV (July 9 - December 17, 2006, every Sunday) as a flagship station. It aired mostly on Japanese Association of Independent Television Stations stations, and Hiroshima Home TV (July 16 - December 23, 2006, every Saturday), a local All-Nippon News Network station in Hiroshima.

Plot
Welcome to the N.H.K. revolves around the lives of several young-adults all living in or around the city of Tokyo. Many different lifestyles are shown though most of the time the story focuses on the concepts of being a hikikomori, anime otaku, and having most of the characters experience intense feelings of depression and loneliness.

The main protagonist is Tatsuhiro Satō, a university dropout entering his fourth year of unemployment. He leads a reclusive life as a hikikomori, ultimately coming to the bizarre conclusion that this happened due to some sort of conspiracy. One day just when his life seems entirely unchanging, he meets Misaki Nakahara, a mysterious girl who claims to be able to cure Tatsuhiro of his hikikomori ways. She presents him with a contract basically outlining that once a day they would meet in the evening in a local park where Misaki would lecture to Tatsuhiro in an effort to rid him of his lifestyle. During these outings, many subjects are discussed, though they almost always pertain in some way to psychology or psychoanalysis. One of their first meetings in fact deals with interpreting Tatsuhiro's recent dreams. Both Tatsuhiro and Misaki, however, have a tendency of over-doing things, such as hiding the truth, especially from each other and themselves. Despite Misaki's offer and pressing attempts at salvation, it is Tatsuhiro's neighbor and high school friend, Kaoru Yamazaki, whom Tatsuhiro often turns to in moments of need and support. Also, despite his own idiosyncrasies, Yamazaki is one of the more stable characters in the story.

The novel also regularly mentions drug use by the main character, and later, his friend, Yamazaki. This element of the story is downplayed in the manga, and left out of the story altogether in the anime (with the exception of Hitomi). This is likely due to several reasons, including a more public-friendly rating, as well as ultimately being unneeded for the progression of the plot.