YOMI is the vocalist of Nightmare and as in other visual-kei band, he is the lyrics writer. He has an alter-ego personality from Sendai Kamotsu named Chiba. He calls himself "Sukebe" (lecher), and often gets slapped when in an interview or before Nightmare plays a show.
- Birth Name: Chiba Jun
- Stage Names: YOMI, Igaguri Chiba
- Birth Date: July 14, 1981
- Height: 155cm
- Blood Type: A
- Hometown: Furukawa (now Osaki), Miyagi Prefecture, Japan
- [2012.06.13] Chiba no Ana vol.1 (千葉の穴 vol.1) (Igaguri Chiba)