Japanese Overnight Buses

Nishinihon (West) JR Bus (Kansai and Kanazawa areas)

Double-decker buses

These double-decker buses mainly used as the "Dream" routes.
The "Premium Dream" between Tokyo and Osaka is more comfortable and luxurious than the normal service.

High-decker buses

The "Keihanshin Dream Saitama" between Kobe-Osaka-Kyoto and Tachikawa, Western Tokyo-Omiya, Saitama Prefecture. They use Isuzu's New Gala.
The "Seishun Dream" services: The cheapest (¥5000) Tokyo and Shinjuku Stations to major cities in Kansai services in Japan.