Do-Can is the fourth album by Masami Okui, released on September 23, 1998.
- Makoon ~1999~ (instrumental)
- Composition, arrangement: Tsutomu Ohira
- Chorus: Masami Okui
- Shu -AKA- (朱 -AKA-) (L.A. version)
- anime television Cyber Team in Akihabara soundtrack
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki
- Kiss in the dark
- PS game Evil Zone theme song
- Lyrics, composition: Masami Okui
- Arrangement: Tsutomu Ohira
- BIG-3
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki
- Chorus: Toshiro Yabuki
- Taiyou no Hana (太陽の花) (isamix)
- Shiawasette... (幸せって...)
- Lyrics, composition: Masami Okui
- Arrangement: Tsutomu Ohira
- Eve
- Lyrics, composition: Masami Okui
- Arrangement: Tsutomu Ohira
- Chorus: Toshiro Yabuki, Tsutomu Ohira
- Climax
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki
- Birth (takemix)
- anime television Cyber Team in Akihabara opening song
- Lyrics: Masami Okui
- Composition: Masami Okui, Toshiro Yabuki
- Arrangement: Toshiro Yabuki
- Vitamin ~Souda, zettai.~ (ビタミン 〜ぜったい、そうだ。〜)
- Extra compilation for Souda, zettai.
- Lyrics: Masami Okui
- Composition, arrangement: Toshiro Yabuki
- Koishimasho Nebarimasho (恋しましょ ねばりましょ) (daitamix)
- Dareka ga Dareka wo (誰かが 誰かを)
- Lyrics, composition: Masami Okui
- Arrangement: Tsutomu Ohira