Kagerou Daze, Vol. 1 (Manga)

Shintarou Kisaragi, a NEET - person "Not in Education, Employment, or Training" - has refused to leave the comfort of his room for two whole years. But Shintarou's easy and solitary life is about to take an unexpected turn when his computer crashes and he is forced to venture into the world he was happy to shut out forever...and stumbles into the middle of a hostage situation!