Yes, it's reverse harem made from otome game, so you shouldn't expect much from it, but it fails even the lowest expectations.
The premise is nothing new, but it seems they haven't even tried to make something out of it. Even the bad guys are a common set (and not the best one) that you'd see in any other anime. We have an aloof five year old blonde girl that acts like she's fifty. Eye patch guy, megane guy with creepy attitude and a busty bombshell that everyone's drooling over. You can make a list of tropes out of it.
I saw a lot of reverse harem anime. No scratch that, I had a short period of being obsessed with them so I tried them all. There were really bad ones (Starry sky) and the ones I actually like very much (Hakouoki). Hiiro no kakera is just a bore, it's not bad, not good, there's simply nothing of interest.
And I really hated their use of 3D in making those forest spirits - looks seriously out of place.
