Popular Route  :  cheaper than train 

      Tokyo  -  Sendai 
      Tokyo station, Shinjuku station  -  Nagoya, Kyoto, Osaka, Kobe
      Osaka  -  Kanazawa, Okayama, Hiroshima, Fukuoka

Popular Route  :  faster than train

      Sendai  -  Yamagata
      Shinjuku station ( Tokyo ) -  Fuji mountain five lakes, Nagano area 
      Nagoya  -  Nagano area
      Osaka  -  Chugoku mountain area
      Kobe, Osaka, Kyoto - Shikoku ( Takamatsu, Tokushima, Matsuyama, Kochi )
      Fukuoka  -  Miyazaki

Willer Express   
kind for women and foreign tourist.

JR Bus Kanto
Japan Railway Bus group. From Tokyo to many cities.   

Japan Bus Online
booking site.