Rumina Sato (Born in Tokyo Japan 12-29-1973). Is arguably one of the most exciting Submission Wrestling based fighters today in Mixed Martial Arts. For a majority of his Career he fought in the 155lb Division in Shooto, but recently has moved down to the 145lb division, with great success. He's also one of the more senior fighters out of K'z Factory, a major school for Shooto Fighters.