It is the only one by NHK! (Volume 1-8 volume)

Publisher: KADOKAWA/Kadokawa Bookstore
Author: Tatsuhiko Takimoto
Size: 128mm x 182mm
Number of books: 8
Language: Japanese
Category: Shonen manga, manga
Latest release date: 2007-07-25

Synopsis:
Tatsuhiro Sato, four years after dropping out of college, was withdrawn. Sato delusions that everything is a conspiracy of a mysterious giant organization, such as quitting college and being unemployed and withdrawn. The organization is NHK (Japan Hikikomori Association). At that time, a mysterious beautiful girl named Cape Nakahara appears in front of Sato. Cape declared the "project" to exhaust Sato from the withdrawal. Sato's counseling begins with the cape, with the purpose of the "project" unknown.