Hikokomiri is a Japanese concept of severe social withdrawal:
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.
In April, 2023, The Japan Times reported
An estimated 1.46 million working-age people in Japan are living as hikikomori (social recluses), a survey by the Cabinet Office showed Friday.
Indian Express and The Guardian also reported the claim.
I find that number to be extreme. [Japan has a population around 123 million people.]
Does Japan have such a high number of people with severe social withdrawal?