Shooto celebrated its 20th anniversary with a bang when it got underway with "The Final Tradition" earlier today from the JCB Hall in Tokyo, Japan.

The event featured a bevvy of prominent Japanese mixed martial artists, some of whom were returning to the small organization that helped kick-start their careers. One of which was victim of a huge upset, Mitsuhiro Ishida.

The lightweight standout -- who is also under contract with Strikeforce in the United States -- battled with Mizuto Hirota, but was tagged with a left hook that was followed up by a straight right to the face, leaving Ishida dazed and confused on the canvas. Hirota went in to dish more punishment but had done more than enough damage to force the referee to intervene.

Premier female mixed martial artist Megumi "Mega Megu" Fuji was also in action. She showed the reason she’s so highly regarded by winning her seventeenth straight bout with superior grappling, ending the fight with a key lock early on into the very first round.

And former Pride FC poster boy Takanori Gomi finally got back to his winning ways by obliterating Takashi Nakakura with a barrage of strikes in an exciting showdown, scoring the knockout in round two.

Gomi -- who once stood atop of the lightweight heap -- has recently endured somewhat of a fall from grace. He recently lost two in a row, including a split decision loss to Sergey Golyaev (12-7) , which led to people questioning his heart and whether he still had what it takes to compete on an active level.

Now it appears he’s re-focused and motivated and ready to once again clamber up the lightweight ladder.

That wasn’t the case for Shooto legend Rumina Sato, who lossed his sixth fight in seven attempts. Sato -- who in his prime never sought to compete outside Shooto because he wanted to capture Shooto gold first -- had a chance at that today but sadly fell short.

He was disposed of by Takeshi Inoue via some nasty ground and pound in the opening stanza in a bout contested for the Shooto lightweight title (143 pounds).

Here are the official results for Shooto: "The Final Tradition:"

Takeshi Inoue (16-3) defeated Rumina Sato (24-14-2) by TKO (4:41-R1)
Takanori Gomi (30-5) defeated Takashi Nakakura (11-3-1) by KO (4:41-R2)
Williamy Chiquerim (13-1) defeated Yusuke Endo (12-3-2) by guillotine choke (5:00-R1)
Mizuto Hirota (11-3) defeated Mitsuhiro Ishida (18-5-1) by KO (1:33-R1)
Kenichiro Togashi (9-6-5) defeated Tetsuji Kato (19-9) via majority decision
Kotetsu Boku (14-5-2) defeated Yutaka Ueda (6-2-1) by TKO (4:56-R1)
Akiyo Nishiura (10-4-1) defeated Takumi Ota (4-3-1 via unanimous decision
Megumi Fuji (17-0) defeated Won Bu Chu (0-1) by key lock (0:52-R1)