http://www.nytimes.com/2006/01/15/magazine/15japanese.html?pagewanted=1&ei=5090&en=7a1fdac3eb790b32&ex=1294981200Seung-Hui Cho might have been a Hikikomori or someone has withdrawn from society to the point of complete isolation and reclusiveness. Although there are Hikikomoris from every culture, Japan has a specific term to describe this increasing phenomenon, which is blamed on the rigorous academic demands on Japanese children (also a reason why the "Asians are smart" stereotype exists).
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