Yellow Song, Red Hair

This (new here) Vocaloid is Teto Kasane, with crazily-styled red hair – and red eyes too! – plus a tail, who was created on April Fools Day as a prank but became so popular that the creator(s) had to keep her going.

This is Miku Hatsune's famous song Yellow, done correctly including the moves/poses at beginning and end, though not while dressed in yellow as Miku dramatically does via an instant change at the live concerts...