Tamariba Club  Tamariba Club is a rugby union club in Tokyo, so-called because it is located near the Tama River (Tamagawa). It has been in existence since 2000, and has also been the top club side in Japan for most of that time. Most of the players are former members of Waseda University Rugby Football Club and Keio University Rugby Football Club. As the champion club team, playing the top university team: