mangas or manhwas with hikikomori

all I can think of is "Incidentally Living Together", its a yaoi manhwa
http://www.mangago.me/read-manga/incidentally_living_together/

Here you go,

http://www.mangago.me/read-manga/zetsubou_danshi_to_chuugoku_musume/

http://www.mangago.me/read-manga/asper_kanojo/ (Does work and does have some acquaintances, but to me MC is a hikikomori)

thanks