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On December 31, 2006, Sugaya once again took the stage at the 57th NHK Kōhaku Uta Gassen as a backup dancer in Morning Musume's performance of Aruiteru, along with the remaining members of Berryz Kobo, Country Musume and Cute.
On December 31, 2006, Shimizu took the stage at the 57th edition of Kōhaku Uta Gassen as a backup dancer in Morning Musume's performance of Aruiteru, along with the remaining members of Berryz Kobo, Country Musume and Cute.
She was introduced to Country Musume in mid-2003 instead of Rika Ishikawa.
On January 28, 2007, she graduated from Country Musume along with member Asami Kimura.