update: May 4, 2015
Hikikomori (deviant behaviour!)
Origin: pulling inward, being confined.
Serious form of social withdrawal known, in Japanese society, as Hikikomori, consisting in the refusal to leave home, go to school, perform routine activity. Young people in this situation often have the internet as the only way to stay in touch with the outside world.
socio-legal aspects
Deviant behaviour
see also