Responses
all I can think of is "Incidentally Living Together", its a yaoi manhwa
http://www.mangago.zone/read-manga/incidentally_living_together/
Here you go,
http://www.mangago.zone/read-manga/zetsubou_danshi_to_chuugoku_musume/
http://www.mangago.zone/read-manga/asper_kanojo/ (Does work and does have some acquaintances, but to me MC is a hikikomori)
mangas or manhwas with hikikomori