EB about 9 years ago According to the artist, Shiina is: 天宮椎菜(アニメディア2010年3月号表紙の御坂美琴コス)Front cover of Animedia March 2010 edition.
EB about 9 years ago EB said:Front cover of Animedia March 2010 edition.And now that I've searched around for it, it's here too: post #616276