ZST

Before establishment

ZST was conceived in efforts to accommodate fighters of shoot-style puroresu MMA promotion RINGS that went defunct in February 2002. On September 22, 2002, Takeshi Caesar, the president of Shoot Boxing Association (SBA), and Koki Hioki, representative of ZST, had a conversation after a Shoot Boxing event, and they announced that SBA would support ZST. For this reason, ZST promoted some matches under shoot boxing rule early on.

First event

The first ZST event "The Battle Field ZST Opening Event" was arranged on November 23, 2002 in Tokyo, and it has since experienced a dramatic increase in popularity possibly in large part due to their highly different rule format. In this event, not only usual MMA matches but MMA tag match also was held among Takumi Yano, Masakazu Imanari and Remigijus Morkevicius, Mindaugas Stankos .

ZST GP

On November 23, 2003, "ZST GP Opening" was held in Tokyo.

On May 17, 2008, ZST announced a major partnership with DEEP. The partnership will allow the two organizations to co-promote shows, share fighters and eventually unify the organizations.

Following its partnership with Deep, ZST continued to hold regular events throughout the 2010s, including its numbered ZST series, the developmental SWAT! series and amateur PRE STAGE events. The promotion expanded its championship divisions and continued to develop fighters who went on to compete in larger Japanese organizations. ZST held its 10th anniversary event in 2012 and continued its regular event schedule into the late 2010s, eventually reaching ZST 70 in April 2021.

ZST's most recent event was ZST 70, held on April 18, 2021. The organization has not held an event since.

ZST Rule

Bouts consist of three rounds with a rest period of one and a half minutes. The first and second rounds are five minutes in duration and the third round is three minutes in duration, but the third round is an extra round. Punches, elbow strikes, knees and kicks are allowed to the head and body when both fighters are standing. On the ground punches, elbow strikes, knees and kicks are only allowed to the body. Bouts are not judged. In the event that the bout goes the full-time, the bout is ruled a draw.

Grappling rule (GT-F Rule)

Bouts consist of two rounds with a rest period of one and two minutes. The first and second rounds are five minutes in duration. The positioning is not regarded for scoring as important factor and any motions including clinching and holding which impedes bouts are prohibited. GT-F came from "Grappling Tournament - Featherweight".

ZST holds various types of events depending on their theme.

• ZST

  The main events held regularly under ZST rule for the top contenders.

• ZST GP

  The tournament events under KOK rule. The events are divided to twice.

• Battle Hazard

  The events focusing the matches which are not under ZST rule.

• GT-F

  The tournament events of grappling.

• Genesis

  The opening matches of ZST and Battle Hazard for the fresh professional contenders.

• SWAT!

  The events focusing the fresh professional contenders who currently participate Genesis matches. It holds "Genesis tournament" every year, and it is an actual freshmen tournament.

• Pre Stage

  The events of grappling for the amateur contenders.

ZST sets 11 weight divisions.