| All France Rugby Club |
| An Immortal Ultraman Club |
| Clover And Bakus Rugby Football Club |
| Dandelions Rugby Football Club |
| Fukuoka Kabutomushi Rugby Football Club |
| Fukuoka Scissors Rugby Football Club |
| Genkai Tangaroa Rugby |
| Gifu Seiryu Ruggers Football Club |
| Hamamatsu Rugby Football Club |
| Hobashira Rugby Football Club |
| Hokkaido Barbarians |
| Kawaminami Rugby Club |
| Kitakami Yahaba Blaze Rugger Rugby Football Club |
| Kobe Regatta & Athletic Club |
| Komaba Water Melon Man |
| Konan Rugby Football Club |
| Koza Rugby Football Club |
| Kumamoto Sundays Club |
| Miyazaki Rugby Football Club |
| Nagoya Rugby Club |
| Oita Kitchomu Rugby Football Club |
| Okayama Rugby Football Club |
| Otakusa Rugby Football Club |
| Phoenix Rugby Football Club |
| RKU Rugby Ryugasaki |
| Rokko Rugby Football Club |
| Rugby Club Ashiya |
| Sharks Rugby Football Club |
| Shinjuku Gaddemazu Rugby Club |
| Tamariva Club |
| Tentoh Mushi Rugby Club |
| Tokyo Crusaders |
| Tokyo Gaijin Rugby Football Club |
| Toshiro Club |
| Urayasu Rugby Football Club |
| Yokohama Country & Athletic Club |
