 In 2005, Isami ended his freelancing days, when he signed a contract with the Union Pro Wrestling promotion.Through Union Pro's working relationship with the Big Japan Pro Wrestling (BJW) promotion, Isami also made appearances for BJW, where he started a storyline with Jaki Numazawa and Mad Man Pondo, which led to him evolving his mixed martial arts-based wrestling style into a more deathmatch-based style.He was trained in the deathmatch style by Numazawa and Jun Kasai at their BJW affiliated School of Death training school.