The Japanese Ministry of Health, Labour, and Welfare defines hikikomori as a condition in which the affected individuals refuse to leave their parents’ house, do not work or go to school and isolate themselves away from society and family in a single room for a period exceeding six months.[10] The psychiatrist Tamaki Saitō defines hikikomori as "a state that has become a problem by the late twenties, that involves cooping oneself up in one’s own home and not participating in society for six months or longer, but that does not seem to have another psychological problem as its principal source