Sonic Channel staff on their blog:
It is Amy celebrating the Hinamatsuri with Sonic Odairi-sama in hand!
Speaking of March, it is Hinamatsuri, isn’t it? The determined Amy in a ladylike manner with Japanese clothing on and also the small Sonic looking somewhat blank are both cute, aren’t they?
The kimono’s collar and someone’s getting on the hand … there you go, everyone!! Most people answered “Ohina-sama,” “Hinamatsuri,” and “Amy.” There were also some people who got the correct answer capturing the detailed characteristics like hair, kimono, and holding the doll of our beloved Sonic….