Tanaka auditioned for a spot in Morning Musume's 5th Generation in 2001 and passed but had to leave the training camp when it was found that she was underage. She attempted again in 2002 for a position in the 6th Generation and passed along with members Eri Kamei and Sayumi Michishige, making Tanaka the only member who auditioned twice to get in. She then provided the main vocals for the single Shabondama, making her one of the few members of Morning Musume who was able to lead on her debut single. She was featured in two solo versions of Memory Seishun no Hikari on a fan club release CD.

On March 28, 2008, it was announced that Tanaka would be voice acting as Kirara, a main character in Sanrio's anime Onegai My Melody Kirara, the fourth My Melody series. The show premiered on April 6, 2008. In 2008, Tanaka became a member and the leader of Hello Project's new unit High-King.

- Wikipedia

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