多分初描きの三好紗南ちゃん。
描いたことがなかった理由は、9割がた公式でスカートのイラストが少ないから。

This is probably my first drawing of Miyoshi Sana-chan.
The reason I've never drawn her before is because 90% of the illustrations of her are official, and of those there are not many with skirts.