Tatsuhiro Satou is 22 years old and NEET (Not in Employment Education or Training). He's 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 Kykai (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 "creator"...to try and impress a mysterious girl!