Uploaded November 2013 | Updated September 2026, 4 hours ago

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Mika-chan.
This song is "1 2 Fanclub" (いーあるふぁんくらぶ / Yie-Ar Fanclub) by Mikito-P, and originally sung by Rin Kagamine and GUMI. I combined it with kradness' version.
Here are the two versions:
Rin and GUMI (with subs): youtube.com/watch?v=np4pZeWG0Qs
kradness: youtube.com/watch?v=MkYMDUJfDeI