 He also competed as a Battlarts representative in Zero-One, U-STYLE, Universal Fighting-Arts Organization and other promotions.In 2006, Otsuka started competing in Michinoku Pro Wrestling under the gimmick of Otoko Sakari, a bisexual, sex addict wrestler who wore a fundoshi and utilized sexual antics against his opponents.Sakari never took off as a serious contender, as he often lost matches by nudity or "morodashi" when his opponent damaged his attire, making the ring crew throw the towel to cover it.