[1] The group based itself after nWo by sporting black and white colors and rebelled against Shoichi Arai's FMW.

On October 14, ZEN competed in its first match in which Onita, Hido and Kuroda defeated FMW's Hayabusa, Nakagawa and Tanaka to win the World Street Fight 6-Man Tag Team Championship.

Later in the night, ZEN members Kanemura, Hosaka, Hido and Kuroda defeated FMW's team of Hayabusa, Masato Tanaka, Koji Nakagawa and Jinsei Shinzaki in an eight-man tag team match when Kuroda pinned Tanaka for the first time in his career.

[6] More friction arose in ZEN following Hisakatsu Oya's exit as Gannosuke and Kanemura became upset at Atsushi Onita for booking his non-title match with the Double Champion Masato Tanaka to be the main event instead of Gannosuke and Kanemura's Brass Knuckles Tag Team Championship defense against Hayabusa and Jinsei Shinzaki on the December 19 show in the Super Extreme Wrestling War tour.

The following night, on December 20, Onita, Hido and Kuroda lost the World Street Fight 6-Man Tag Team Championship to Hayabusa, Masato Tanaka and former ZEN member Hisakatsu Oya.

[8] On December 21, Onita, Hido, Hosaka (as The Great Fake), Kuroda and Gladiator lost to the ECW team of Terry Funk, The Sandman, Tommy Dreamer and Dudley Boyz.

[9] On December 22, a turning point took place in the history of ZEN when Onita, Gannosuke and Kanemura lost to Hayabusa, Masato Tanaka and Jinsei Shinzaki in a Barbed Wire Baseball Bat Ladder WarGames match when Hayabusa pinned Onita following a Moonsault from the top of the cage, which he had failed to do at the 6th Anniversary Show.

The man was revealed to be Koji Nakagawa, who had left FMW a week ago due to being upset with his position in the company and joined ZEN as the group's newest member.

On January 7, 1998, ZEN promoted its first show in the nWo Souled Out-themed format, in which Onita, Nakagawa and Kuroda defeated Gannosuke, Kanemura and Hido.

On February 13, Onita, Nakagawa and Kuroda defeated Gannosuke, Kanemura and Jado to win the World Street Fight 6-Man Tag Team Championship at ZEN's second promoted show.

[13] ZEN promoted its third show on March 13, on which they lost to TNR's Mr. Gannosuke, Horace Boulder, Hido and Yukihiro Kanemura.

Onita, Nakagawa and Kuroda lost the World Street Fight 6-Man Tag Team Championship to Kodo Fuyuki, Yukihiro Kanemura and Hido, forcing ZEN to disband and FMW owner Shoichi Arai was forced to lick Go Ito's boots as a result of pre-match stipulation.

Onita went on a leave of absence after the dissolution of ZEN because he felt that he was not being booked properly and he was enraged at putting over Kodo Fuyuki.