Tatsuhiro Satou is 22 years old and NEET (Not in Employment, Education, or Training). Hes also a shut-in, or hikikomori. Not even the obnoxiously loud music from next door can snap him out of it and is under the delusion that he is the subject of a conspiracy by the Nihon Hikikomori Ky?kai (NHK), a secret organisation whose sole intention is to produce a world filled with hikikomori. The discovery that his music-playing neighbour is a perverted otaku disenchanted with real life, only drags Sato further into his psychological black hole, but offers him an interesting opportunity: he will make a gal game (i.e. hentai) as proof that he is a creatorto try and impress a mysterious girl!