Hikikomori

Hikikomori (ひきこもり or 引き籠もり Hikikomori, literally "pulling inward, being confined", i.e., "acute social withdrawal") is a Japanese term to refer to the phenomenon of reclusive adolescents or young adults who withdraw from social life, often seeking extreme degrees of isolation and confinement. The term hikikomori refers to both the sociological phenomenon in general as well as to people belonging to this societal group. Hikikomori are often associated with otaku but the terms are distinct.