It's unclear if this NERVOUS (with vocalist Hirofumi) is the same as the later NERVOUS (with vocalist Mizuki). Both were said to have formed in Hokkaido (北海道), and the former is said to have been active from 1993~1997, while the latter was active in Hokkaido by 1996 at the earliest...

So either two bands in the same area used the same name at the same time, or NERVOUS somehow completely changed its lineup over the course of a few years. (It's possible that vocalist Hirofumi is the same person as bassist HIRO, but there's no evidence aside from the name.)