Z-1 was a Japanese pop group from 1999 to 2002. The group was formed in 1998 after all four girls won the 7th Annual All Japan National Beautiful Girl Contest in 1998. They became a regular on various television shows and debuted on July 1999 with the single "Vibe!".

Sadly, the group broke up in 2002 with each girl pursuing their own career. Ueto Aya and Nejiki Mami went on to pursue successful solo music careers. Meanwhile, Fujiya Mai went onto become an actress.

Members:

Ueto Aya

Nishiwaki Manami

Nejiki Mami

Fujiya Mai