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In page Risa Niigaki:

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In 2001, Niigaki joined Morning Musume as the fifth generation along with Ai Takahashi, Asami Konno, and Makoto Ogawa. Morning Musume producer Tsunku said he chose Niigaki because she "shined during the final studio recording" for the audition song that all the finalists had to sing.[1] She debuted and lead on the group's 13th single, "Mr. Moonlight (Ai no Big Band)" making her one of the few members of Morning Musume who was able to lead on her debut single. She first appeared in their 4th album, 4th Ikimasshoi!. In the summer of that year, she also debuted in a shuffle unit as part of Happy 7, with two other members of her generation (Ai Takahashi and Makoto Ogawa).[citation needed]