KEWPIE (キューピ) forms in Tokyo (東京)東京.
It is only conjecture that KEWPIE (キューピ) and ZERØ are the same band. In fact, very little is known about KEWPIE (キューピ) in general.
It is said that a band named KEWPIE (キューピ), featuring Aya (彩) and HIRO, had started appearing at KEY PARTY lives after the disbandment of Missalina Rei. That disbandment took place on November 17th, 2000.
In a 2001 interview, ZERØ stated that they formed in November 2000. Given the timing of when KEWPIE (キューピ) appeared and the two shared members, it seems likely that the two are the same band.
That being said, the existence of KEWPIE (キューピ) was murky even at the time, given the confusion among BBS discussions. It's worth noting that the very similarly named Cupid (キューピト) was formed by ex-KEY PARTY members around the same time.
ZERØ disbands by this point
ZERØ was a visual kei band in Tokyo. They were active from 2000 to 2001 and are now disbanded.