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既に3話分でクレジットされてるね

Unikitty! (2017– )
Full Cast & Crew
http://www.imdb.com/title/tt6874502/fullcredits

Series Music Department
Babymetal ... performer: theme song (3 episodes, 2017)
Kei Kobayashi ... theme written and performed by (3 episodes, 2017)