Arcana 15 info.
The 15th volume of Arcana anthologies will have a cover drawn by Mikanagi Touya and feature a oneshot by her. Lol, I knew Mikanagi wanted to draw a school-centric story, but I didn't know she would do it so soon! XD
Source: http://www.animate-onlineshop.jp/products/detail.php?product_id=1015946