Her-Day is the fifth album by Masami Okui, released on August 27, 1999.
- M2000 ~Prologue~ (instrumental)
- Composition: Masami Okui. Toshiro Yabuki
- Arrangement: Toshiro Yabuki
- labyrinth (star version)
- Ketsumatsu
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki, Hideki Sato
- Naritai (なりたい)
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki
- Ru-Ru-Ru (ルルル)
- Key
- Makafushigu na Nanafushigi (摩訶不思議な七不思議)
- Lyrics: Masami Okui
- Composition: Masami Okui, Toshiro Yabuki
- Arrangement: Toshiro Yabuki
- Te no hira no Kakera (手のひらの破片)
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki
- Last Scene (ラストシーン) (M.original mix)
- Tenshi no Kyuusoku (天使の休息) (type R mix)
- Love Sick
- Lyrics, composition: Masami Okui
- Arrangement: Toshiro Yabuki, Hideki Sato
- Kitto Ashita wa
- anime television series Ojamajo Doremi ending song
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki
- Hot Spice (M.original mix)
- Toki ni Ai wa (時に愛は) (H-D mix)
- In This Arm
- anime television series Slayers image song
- Lyrics, composition: Masami Okui
- Arrangement: Toshiro Yabuki
- Never die
- OVA Slayers Excellent theme song
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki
- Maria (マリア)
- Lyrics, composition: Masami Okui
- Arrangement: Tsutomu Ohira
27 August 1999