21 seiki (Limited Edition)
21世紀 (初回限定盤)
CD + DVD - maxi-single
- release date: 28.03.2007
- label: avex marketing communications
- catalog number: AVCA-26194/B
- country: Japan
related artists
tracklist
| 01 | 21 Seiki | 21世紀 |
| 02 | RADIO DAYS RADIO NIGHTS | |
| 03 | 21 Seiki (Karaoke) | 21世紀 (カラオケ) |
| 04 | RADIO DAYS RADIO NIGHTS (Karaoke) | RADIO DAYS RADIO NIGHTS (カラオケ) |
| DVD01 | 21 Seiki ～promotion video～ | 21世紀 ～promotion video～ |
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