is a Japanese former mixed martial artist and professional wrestler who currently competes for Ganbare Pro-Wrestling, where he was a Spirit of Ganbare World Openweight Champion and Spirit of Ganbare World Tag Team Champion. He competed in the Flyweight, Bantamweight and Featherweight divisions. Katsumura is credited in popularizing the "Ninja Choke" submission and is the current owner of ZST.
After graduating from university, he worked as an employee at a child care facility in Kamakura while continuing his martial arts training. This is where his nickname "Real Tiger Mask" comes from.
|- | Loss | align=center| 11-9-3 | Koetsu Okazaki | TKO (Punches) | | | align=center| 2 | align=center| 2:24 | Tokyo, Japan | |- | Loss | align=center| 11-8-3 | Darren Uyenoyama | TKO (Punches) | | | align=center| 2 | align=center| 3:53 | Tokyo, Japan | |- | Win | align=center| 11-7-3 | Masakatsu Ueda | Submission (Ninja Choke) | | | align=center| 2 | align=center| 3:39 | Tokyo, Japan | |- | Win | align=center| 10-7-3 | So Tazawa | Submission (D'Arce Choke) | | | align=center| 1 | align=center| 3:54 | Tokyo, Japan | |- | Win | align=center| 9-7-3 | Hiroyuki Yamashiro | Submission (Twister) | Zst: Zst 20 | | align=center| 1 | align=center| 2:56 | Tokyo, Japan | |- | Loss | align=center| 8-7-3 | Alexandre Franca Nogueira | KO (Punch) | K-1 HERO's: Middleweight Tournament Opening Round | | align=center| 2 | align=center| 1:55 | Yokohama, Japan | |- | Loss | align=center| 8-6-3 | Katsuhiko Nagata | TKO (Punches) | K-1: Premium 2006 Dynamite!! | | align=center| 1 | align=center| 4:12 | Osaka, Japan | |- | Draw | align=center| 8-5-3 | Kentaro Imaizumi | Draw | Zst: Zst 11 | | align=center| 2 | align=center| 5:00 | Tokyo, Japan | |- | Win | align=center| 8-5-2 | Artemij Sitenkov | Submission (Choke) | Shooto Lithuania: Bushido | | align=center| 1 | align=center| 2:29 | Vilnius, Lithuania | |- | Draw | align=center| 7-5-2 | Kenichi Osawa | Draw | Zst: Zst 9 | | align=center| 3 | align=center| 3:00 | Tokyo, Japan | |- | Win | align=center| 7-5-1 | Kit Kieu | Submission (Armbar) | Zst: Zst 8 | | align=center| 1 | align=center| 4:21 | Tokyo, Japan | |- | Win | align=center| 6-5-1 | Sergej Juskevic | Technical Submission (Omoplata) | Zst: Battle Hazard 2 | | align=center| 1 | align=center| 2:51 | Tokyo, Japan | |- | Loss | align=center| 5-5-1 | Hideo Tokoro | Technical Submission (Guillotine Choke) | Zst: Grand Prix 2 Opening Round | | align=center| 1 | align=center| 0:38 | Tokyo, Japan | |- | Loss | align=center| 5-4-1 | Marcos Galvao | Decision (Unanimous) | | | align=center| 3 | align=center| 5:00 | Tokyo, Japan | |- | Win | align=center| 5-3-1 | Eugenij Konkov | Submission (Rear-Naked Choke) | | | align=center| 1 | align=center| 2:48 | Tokyo, Japan | |- | Loss | align=center| 4-3-1 | Kentaro Imaizumi | Decision (Unanimous) | | | align=center| 3 | align=center| 5:00 | Tokyo, Japan | |- | Win | align=center| 4-2-1 | Alfonso Alcarez | Technical Submission (Triangle Choke) | | | align=center| 2 | align=center| 3:04 | Tokyo, Japan | |- | Draw | align=center| 3-2-1 | Kentaro Imaizumi | Draw | | | align=center| 2 | align=center| 5:00 | Setagaya, Tokyo, Japan | |- | Win | align=center| 3-2 | Ryan Diaz | Decision (Unanimous) | | | align=center| 2 | align=center| 5:00 | Setagaya, Tokyo, Japan | |- | Loss | align=center| 2-2 | Hiroaki Yoshioka | Submission (Armbar) | | | align=center| 2 | align=center| 3:43 | Setagaya, Tokyo, Japan | |- | Win | align=center| 2-1 | Takeyasu Hirono | TKO (Cut) | | | align=center| 1 | align=center| 4:17 | Setagaya, Tokyo, Japan | |- | Loss | align=center| 1-1 | Mamoru Yamaguchi | Decision (Unanimous) | | | align=center| 2 | align=center| 5:00 | Tokyo, Japan | |- | Win | align=center| 1-0 | Masaki Nishizawa | Decision (Unanimous) | | | align=center| 2 | align=center| 5:00 | Tokyo, Japan |