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3nin Matsuri (三人祭; Three-Person Festival) was one of the three Hello! Project shuffle units formed in 2001, along with 7nin Matsuri and 10nin Matsuri. 3nin Matsuri was the most successful of the 2001 shuffle units.
- Ishikawa Rika (石川梨華) (Morning Musume)
- Kago Ai (加護亜依) (Morning Musume)
- Matsuura Aya (松浦亜弥)
- [2001.07.04] Chu! Natsu Pa~rty (チュッ！夏パ～ティ; Kiss! Summer Party)
Compilations / Other
- [2001.12.19] Hello! Project - Petit Best 2 ~3, 7, 10~ (#1 Chu! Natsu Pa~rty)
- [2008.12.10] Hello! Project - Hello! Project Shuffle Units Mega Best (#4 Chu! Natsu Pa~rty)
- [2001.08.29] The 3, 7, 10nin Matsuri
- Hello! Project Official Website: Shuffle Units Discography page