Full Moon wo Sagashite

A Long Day in the Studio (1x6)

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Mitsuki and Takuto (pretending to be a doll) go to the studio to do a recording while Meroko stays at home, posing as Mitsuki. While Mitsuki learns what to do in a recording booth, a little girl named Nanami sneaks in and takes Takuto away. When Mitsuki finds them, Nanami refuses to give Takuto back.