Certain details about this band are murky. For reference, the band photos on this page are taken from a Ver:tige demotape and feature members YU-KI, RYUJI, Haruna (遥那), and KENGI.
A poster advertising a 1995-11-21 event features a band called Vertige, but the image of said band only shows one person—presumed to be the vocalist and only slightly resembling the vocalist in the picture from Ver:tige's demotape. That said, the event took place in Osaka (大阪), which lines up with this band's activity area. Furthermore, KISAKI also performed at the event, and he would eventually sign the next band of RYUJI and Haruna (遥那). So it's presumed, but unconfirmed, that this band formed in 1995 and is the band featured on that poster.
More confusing is that a certain source claimed that a person named Rinne (凛廻) was the vocalist of a band called Vertige. The alleged OHP of Rinne (凛廻) simply redirects to the Clothoid÷Doll website—implying that the vocalist of Vertige would later go on to Clothoid÷Doll.
However, the vocalist of Clothoid÷Doll sounds nothing like the recordings that we have of Ver:tige, and Clothoid÷Doll guitarist Aya (綺) is the only person who remotely resembles the vocalist of Ver:tige. So there's a slight, but completely unconfirmed, possibility that Rinne (凛廻) and Aya (綺) are the same person.
That being said, all known releases by Ver:tige list the vocalist as YU-KI. So either the source claiming Rinne (凛廻) was vocalist was incorrect; or Rinne (凛廻) was an earlier name of YU-KI; or Rinne (凛廻) was an earlier vocalist; or there was a different band named Vertige active around the same time. Details are completely unclear.
For now we've listed Clothoid÷Doll guitarist Aya (綺) as a previous vocalist under the name Rinne (凛廻), but keep in mind that this is 100% unconfirmed.
By this time(?), Ver:tige (ベルティージュ) forms in Kyoto (京都)京都.
V. Rinne (凛廻) (?) / (?)
By 1998 at the latest (but perhaps since formation), the band's lineup is as follows.
V. YU-KI / G. RYUJI / B. Haruna (遥那) / D. KENGI
Around this time, Ver:tige likely disbands
Ver:tige was a visual kei band in Kyoto. They were active from 1995 to 1998 and are now disbanded.