Summon night 5 was originally released on the PSP a few years ago and never received an English release. After it was proven there was enough interest in the game Gaijinworks decided it was time for it to happen. This release of Summon Night 5 includes the original PSP game as well as a code that will let you download the game digitally to be able to play it on the Vita as well. Additionally, Bandai Namco announced that Summon Night 6 is in the works, and is being made for the Playstation 4 and the Playstation Vita. An English version of Summon Night 6 will probably depend on the sales of Summon Night 5, and how it is received. The pre-orders will be available until September 7th so if you like the Summon Night series you can still pre-order Summon Night 5 here on their site:
The physical version of the Summon Night 5 LE will be released soon, and here is the English gameplay trailer for it.
Here are the Summon Night 6 main characters:
Summon Night 6 Male Protagonist
Summon Night 6 Female Protagonist