All Japan Weight Category Champions - IKO 1

All Japan Champions - IKO 1

All Japan Champions - IKO 2

All Japan Results - IKO 1

All Japan Results - IKO 2

All Japan Weight Category Champions - IKO 1

All Japan Weight Category Champions - IKO 2

All Japan Weight Category Championships - IKO 1

All Japan Weight Category Championships - IKO 2

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Year Lightweight  Middleweight  Heavyweight  Super Heavyweight 
2007 Yuuki Fukuii Yuzo Suzuki Osamu Sumitani Makoto Taniguchi
2006 Yuzo Suzuki Zenjyurou Mori Osamu Sumitani Darmen Sadvokasov RUSSIA
2005 Makoto Ozaki Tomohiko Matsuoka Hiroyuki Kidachi Mikhail Kozlov RUSSIA
2004 Yuuki Fukuii Takamitsu Sakurai Kenshin Morimura Jan Sokup CZECH REP
2003 Osamu Shiojima Toshihiro Kanamori Masato Ikeda Hirokazu Kondo
2002 Osamu Shiojima Shin Itoh  Naoji Mikoshiba  Lechi Kurbanov RUSSIA
2001 Yuuki Fukuii Yuji Shin Yoshinori Ikeda Atsushi Kadoi
2000 Masafumi Tagahara Hiroyuki Kidachi Kentaro Tanaka Hirokazu Kondo
1999 Ryu Narushima Hiroyuki Kidachi Shinji Adachi Kiyoyuki Shida
1998 Hiroyuki Kidachi Yuji Arai Atsushi Kadoi Kiyoyuki Shida
1997

No Tournament due to the 1st World Weight Category Championships. 
Click here for results.
Year Lightweight Middleweight Heavyweight 
1996 Masafumi Tagahara Ryu Narushima Masayoshi Takaku
1995 Ryu Narushima Testuo Seto Tatsuya Iwasaki
1994 Kou Tanigawa Hiroyuki Miake Niiho Satoshi
1993 Kensaku Yamamoto Hidenori Aoki Kenji Yamaki
1992 Kensaku Yamamoto Eiji Kawamoto Yoshihiro Tamura
1991 Kensaku Yamamoto Naoyuki Sonoda Yoshihiro Tamura
1990 Kenji Midori Kyouichi Taguchi Tatsuya Iwasaki
1989 Seiji Yamame Hiroyuki Miake Yashuri Shichinohe
1988 Takahiro Kajiwara Hideki Shibata Masashi Kimoto
1987 Kenji Midori Yasuhiro Kuwajima Yashuri Shichinohe
1986 Takahiro Kajiwara Hidehiko Hashizume Yoshitaka Nishiyama
1985 Kenji Midori Takehisa Iriki Yashuri Shichinohe
1984 Masahiro Oga Hideaki Kakinuma Yashuri Shichinohe