- Okui Masami
- Catalog Number
- Moonlight Angel -Ashita ni Mukatte- (明日に向かって; Facing Tomorrow)
- I WAS BORN TO FALL IN LOVE
- Ryoute Ippai no Yume (両手いっぱいの夢; Both Hands Filled of Dreams)
- FULL UP MIND
- BEATS the BAND
- Fushigi na Yoru (不思議な夜; A Curious Coincidence Night)
- My Jolly Days
- It's DESTINY -Yatto Meguri Aeta- (やっと巡り会えた; It Day Finally Came Around and We Were Able to Meet)
- Live Alone... Sennen Tattemo (Live alone... 千年たっても; Live Alone... After 1000 Years)
- Dare Yori mo Zutto... (誰よりもずっと...; From Someone for Forever)
- Bay side love story -from tokyo-
Gyuu is the debut studio album released by Okui Masami. In Japanese, "gyuu" is a sound for someone trying to fit many things into something. The album reached #47 on the Oricon weekly charts and charted for two weeks, selling 11,450 copies.
- Gyuu profile. HOT PINK SPICE.