Tales of Zestiria doujinshi, first one in the series by Gatekeeper. It's a Sorey x Mikleo pairing, has Sorey on the cover. Here is the link to the out of stock page on Toroana to see the exact doujinshi.
Thank you for your inquiry.
It might be sold after first week of May
http://www.toranoana.jp/bl/article/04/0030/29/05/040030290565.html
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