It has been announced that Hiromu Arakawa's Arslan Senki manga will bundle OVAs in the fifth and sixth volumes, to be released on May 9 and December 9 respectively. 

Episode 1 (The Road of Blood and Love): Arslan gets to spend some time with Gieve alone, so Gieve decides to tells some interesting stories about Narsus, Daryun and Elam's past love lives.
 
Episode 2 (Banquet of Friendship): The battle between Rajendra and Gadevi has ended. Arslan and the others prepare to leave Shindra but will first spend some time in the castle.

Arslan Senki (TV) OVA