The reasons why I enjoyed this OVA much were 1) unlike other OVA standalone episodes this one clearly continues from where main TV series finished, though not in the context of the overall plot.
The OVA acknowledges the Noumi incident, and Chiyu is actively hanging around with Kuroyukihime, Haru, and Taku in this game-mission.
2) This OVA presents fun enjoyment while also dealing with the current insecurities between Haru and Kuroyukihime's relationship. The boy's beating too much around the world, because he feels he cannot do much for an overly independent girl like Kuroyukihime.
Truth is that Haru gives too much credit to his princess. In the inside, the girl is just as shy and frail at issues like confronting their companionship, and only wishes time to time to be comforted and lead by Haru.
3) Haru's Pig avatar with FPS guns and military gear is the RULE!!
4) Chiyu went to crazy, berserker, Niko mode. Niko in homage to the current Red King who she goes all cahoots and bananas showering and nuking endlessly everything on sight with missiles, bombs, bullets, and all while letting out her demented laugh.
