After they went on indefinite hiatus in 2001, he formed the industrial rock duo Eve of Destiny and also started a solo career.

During his time in Malice Mizer, Közi often assumed the role of a pierrot doll, dressing in clown-like costumes with large ruffs, always in shades of red, his favorite color.

He performed bass, and occasionally vocals due to revolving lineups, in many cover bands around his hometown in Niigata.

[1] Közi's career began in 1989 at 17 years old in the underground band Beyond the Rein Sight, and, later, as a member of Girl.

Közi and Mana left Matenrou after deciding they both had similar ideas about creating music, they formed Malice Mizer in 1992.

After Malice Mizer disbanded in 2001, Közi joined Haruhiko Ash (from The Zolge) and created Eve of Destiny, an industrial rock band that toured outside Japan several times.

The band played its first live on October 18 at Shinjuku Marz during the Tokyo Dark Castle ~ Halloween Special event, which also featured Auto-Mod and Aural Vampire.

[6] Following a hiatus that began in 2013, XA-VAT resumed activities in 2018 and released the mini-album K-I-S.[7] Közi performed in Paris at Porte de Versailles on April 9 and 10, 2011, with guest Miyu from Royal Cabaret.

[8] He planned to go to Moscow with The Candy Spooky Theater and Velvet Eden for a Halloween concert,[9] however, it was moved and took place in Japan.

In 2012 he formed the band ZIZ (ズィズ), composed of his backing band from his solo career; with himself as vocalist and guitarist, bassist Sugiya (Moi dix Mois), guitarist Jiro (Bioactive), keyboardist Yugami (Yugami Hakase) and drummer Chargeeeeee... (Omega Dripp).