Just a dumb comedy spinoff. It made me chuckle a few times at its ridiculousness but I think this had to be much funnier to a Japanese audience that it is to us in the West. You can totally skip this OVA and not be missing much. It's pretty to look at and it can make you chuckle a little; you just have to accept it is what it is and move on. It's a side story that adds nothing to the main plot....it's repetitive and not all that funny. Sentai didn't even bother trying to dub this...just slapped on some subtitles and said "ok hoss, have at it."
Ilya and Kuro don't really put in an appearance until like the final 30 minutes or so. I watched it mainly to be a completionist for the Prisma side story. Can't wait to actually watch the final capper movie, Vow in the Snow. This OVA very much breaks the 4th wall by mentioning the final movie in passing.
