Haruna Osato is a Japanese singer managed by MYSTIC Story. She was confirmed to be a member of MYSTIC Rookies on October 4, 2021, participating in a dance cover of Cardi B's "Up" alongside other MYSTIC Rookies members Suhyun and Haram. She is a member of the girl group Billie, which debuted on November 10, 2021.

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