I came across “hikikomori” in this short review by Mark Panek, and, being an ignoramus, was immediately fascinated:
Yasukata Tsutsui’s “The Lion” thus turns from a light surrealist piece about being yourself into a kind of indictment, when we learn in the accompanying interview that he has quit writing altogether, withdrawn in protest like a hikikomori walled off from his oppressive, conformist world.

The New York Times did a report about a year ago:
Like Takeshi and Shuichi, Y.S. suffered from a problem known in Japan as hikikomori, which translates as “withdrawal” and refers to a person sequestered in his room for six months or longer with no social life beyond his home. (The word is a noun that describes both the problem and the person suffering from it and is also an adjective, like “alcoholic.”)

Here’s a link to a page about Francesco Jodice’s film on the subject.

I’m fascinated by the hikikomori phenomenon, but somehow I can’t see this working in the Indian context:

“Rajesh bete, come out and say hello to Aunty Pushpa.”
“Oho, don’t bother the boy, my daughter was telling he’s gone hikikomori.”
“Hikikomori-nikikomori, I don’t know, but he must have some manners, no?”

Or:
Rajesh sits in his bedroom, brooding. He will spend the next six months in here, maybe longer, far, far away from the world.
“Rajesh bete, don’t mind, na, but Sushma needs to use your bathroom, Chachaji is having his hair-oil-shampoo-bath for so long, poor thing is needing to go.”
Rajesh says nothing; Sushma comes in, giggles, uses bathroom, comes out, giggles, leaves.
Rajesh sits in his bedroom, brooding. He will spend the next six months in here, maybe longer, far, far away from the world.
“Rajesh bete, sorry but the mistri is here to fix the pipes, leaking-sheaking, I told your father not to buy this flat, such shoddy construction but he always knows best. Accha and Renu Aunty is leaving Nikhil here–” enter pimply youth–“for the evening, he will sit and watch Naach Baliye, Nikhil bete, not to bother Rajesh, ok? Oh, and Chachaji says he might sleep here at night, because the baby is yelling only and keeping him awake, he can’t do pranayama in morning and his bowels are not opening fully, one full jar of Isabgol he had but still–nothing!”
Rajesh sits in his bedroom, trying very hard to brood, but it just doesn’t seem that easy any more.