You can search for NC Official Internet Café in Japan by this app.
Official internet cafes.
About NC Official Internet Cafe:
NC official internet cafe is the internet cafe approved by NC Japan. At Official cafes, you can enjoy our visually stunning game, the Tower of Aion, or Lineage, Lineage II with comfortable environment.
Key Features:
-Locate Internet Cafes based on the location-based services
-Lots of details about each cafe including game titles you can play
-Searches cafes by store names, addresses, and phone numbers
-Advanced prefecture search
-Provides event information held at each cafe
-Add your favorite cafe to “My Favorites” list
-Internet Cafe FAQ
-Profiles of the games offered by NC Japan