This had so much potential. If this anime wasn't such a harem comedy type, it could have had such a good plot. I know i shouldn't be expecting anything too great, but honestly, this could have been really cool. If it incorporated a dramatic or more intense serious mood, it may have been really good.
What I DID like about it was the fact that he can use any earth weapon, especially the Zero (history buff). well, its decent for being a harem, ecchi, comedy anime, but it could have had a better story. If it took itself a tad more seriously like Chivalry of a Failed Knight did (which was a pleasant surprise), it would be a 9/10
Overall, this is a 5/10 for me, not that great. I'm on the 2nd season while writing this, so hopefully it gets better.