Zi:Kill (originally called G-Kill) was formed in November 1987 with Ken on guitar and Seiichi on bass. Tusk joined in February 1988 and soon after Masami joined on drums. On April 20 they played their first show at Meguro Rokumeikan. In 1989 they released their first album, Shin Sekai ~Real of the World~ on the label Ghost Disc. The album was reissued on July 21, this time distributed by Extasy Records, whose founder Yoshiki was introduced to the band by his X Japan bandmate hide, and with the extra track "Karei". After a May 3 concert at Meguro Live Station Masami left the group.
After a small tour Zi:Kill went to London, where they worked on their major label debut. The group had become known for infighting within the band, and upon completing the album, Yukihiro was fired at a December 28, 1990 gig at Kawasaki Club Citta.
In January 1992, Zi:Kill announced they had resumed activity with new drummer Eby. As free agents they collaborated with Extasy Records on a history compilation album of songs from their indies albums, along with their newest single "Hero" and new songs "Crack Eye" and "Don't Ask Me!" especially for the record. Tomorrow... was released in 1992 and hit number 34 on the Oricon charts, a monumental success for an indies album. In retaliation, Toshiba EMI released its own Zi:Kill compilation album, Disgrace - The Best, two months later.
For the recording of 1993's Rocket, Zi:Kill went back to London. Ranking 5th on the Oricon, it marked their highest chart appearance. The single "Calling" was also a success, being used as "Tony's Theme" in the anime Fatal Fury 2: The New Battle.
After a nationwide tour titled Flying Rocket 1993, they performed at the Nippon Budokan again on January 11, 1994. This was their last performance, as in May 1994 Zi:Kill disbanded.
Post Zi:KillKen went on to release a number of solo efforts, featuring ex-Zi:Kill drummers Yukihiro and Eby. He also formed the bands Vast and Cry Baby, but currently is a studio musician and producer, as is Eby.
In 1994 ex-drummer Tetsu formed the short lived band Body, with his fellow ex-D'erlanger member Cipher. In 1995 Seiichi teamed up with them both to form Craze.
Tusk initially formed a solo unit, with ex-Zi:Kill drummer Tetsu and Kyoji Yamamoto of Bow Wow supporting him. He released one single titled "3 Songs" in 1996, but ceased solo activities after its release. He then joined The Slut Banks, who released four albums between 1996 and 2000 before disbanding.
In 2006 Craze ended activities, Seiichi would join Nakada Band, who later changed their name to The Heavenly Curve, with former members of Deep and By-Sexual's Nao. 2007 brought the revival of D'erlanger, and Tetsu rejoined accordingly. Also in 2007, Seiichi formed Vez with Yana (Zeppet Store), Asaki (Age of Punk, Bug, ex-Guniw Tools) and Futoshi Takagi (Bad Six Babies, ex-Hate Honey). He formed Johnny Loves Brautigan in 2010.