Sailor Moon
Usagi's Idol: The Graceful Genius Michiru (3x4)
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Usagi feels lousy and wants to be a better person, like Michiru. Michiru invites her, the girls and Mamoru to a violin concert, and they agree. At the concert, the violinists violin is changed to a daimon named Octave, so the warriors and the mysterious warriors work together to stop Octave, and save the heart.