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20 Sai
- Artist
- Moritaka Chisato
- Song
- 20 Sai (20才; 20 Years Old)
- Lyrics
- Moritaka Chisato
- Music
- Saito Hideo
- Other Information
- Arrangement: Saito Hideo
"20 Sai" is a pop song by Moritaka Chisato. It appears on the "17 Sai" single as track #2.