i saw a documentary on this phenomena not long ago; lots of young Japanese men addicted to digital games, pornography and 'virtual' girlfriends who are scared of the idea of actually forming a relationship with a real woman.
while it's very troubling (and easy to mock) we need to look at the reasons behind it; many of these same young men feel that they can't provide a decent standard of living for a family due to the job/economic situation, and can't make more money than their parents did, so they already see themselves as having failed.
In my experience, most of these losers have an unjustified sense of entitlement- 'I went to university, why don't I earn a six figure salary? Where's my respect!', or even just 'my mum stayed at home and waited on my father hand and foot, that's what a woman should do. A women's place is in the kitchen!'
I'm not making this up.