Releasing the same date as the NA PSN version, Asterisk War: Phoenix Festa is coming to EU PSN the same day & date.

A.W. Phoenix Festa will launch for PS Vita via PlayStation Network in Europe, the Middle-East, Africa, and Australasia on July 26 alongside the previously announced American release, Bandai Namco announced.

As covered prior, the game is a action title taking characters and locations from the anime/light novel all the while mixing in dating sim elements between fights. Bandai Namco is publishing & developing the game and we will cover more on the title as information comes out.
Source: Gematsu