Is it actually called "IWA Tsurumi"? It used to be IWA Kakutoushijuku, but the current name is Kokusai Puroresu Promotion.
Tsurumi, whose real name is Takao Tanaka, started in the old IWE (the most famous version of "Kokusai Puroresu") and was popular as a heel. After IWE closed in 81, he joined All Japan. Jumped to SWS when it started and NOW when SWS split. He started IWA Kakutoushijuku in 93 and Kokusai Pro in 97 (or something like that).
Tsurumi's Kokusai Pro is known for having cards at parking lot of supermarkets in Kanagawa prefecture with a lot of monster gimmick wrestlers.