GMO on December 26, 2016 ended the service of the Paper Man. This a final decision and the company doesn’t planning to turn back the game online.
The service end announced on September 26, 2016 after some fatal bug detection what the company couldn’t fix.

The Paper Man was online for more than 7 years and it was a very popular online shooter game in Japan so it is a huge cut on GMO’s budget.
GMO as a Good Bye published a memorial page where you can see all the avatars in chibi form and a notice message about the service end.

It is so sad, but sometimes a shutdown is cheaper than running a game with problems.