The story for this OVA is mostly focused on Rin and a bit of her background story. It covers the weird time gap between episodes 8 and 9 of Hana no Uta, so that's when I watched it, and it seems to be the perfect timing plot wise to watch it, as I imagine if you watched this before watching Hana no Uta, then it would be hard to grasp the characters and such as they are only very briefly explained or mentioned in this OVA. Very typical of the shounen, action, fantasy genre. I personally like this kind of art style, although I haven't read themanga, I'll be sure to put it on my list.