tl;dr: A manga that relies on its characters and comedy but doesn't do well either either.

This is described as a shounen fantasy harem, but it really isn't much of any of those. There is a male protagonist that feels like he's going to be important at first, but as it goes on he loses importance quite a bit to the point he doesn't feel important at all. He's certainly not at the center of some relationship web. That's not to say that the other characters are much better off though, because even though the girls seem to be the focus most of the time, they have really flat characters with no character arcs whatsoever, and furthermore no relationship development really occurs at all. Also, even Fukuyama seems to be a larger focus than Yukinari, as he's often at the center of most of the comedy. The thing though is that he's really annoying from the beginning, so him basically playing the same joke repeatedly gets really old immediately and the comedy quickly becomes not all that amusing. That's a problem because the manga seems to be relying completely on its comedy as the plot doesn't have much worth anything. As mentioned, it's not really much of a fantasy, it has some random tidbits of supernatural elements, but it uses them incredibly rarely outside the beginning and end. Rather, it's just some really simple episodes in a really basic setting, which due to the fact that the comedy got annoying actually made it very dull. The end tried to wrap things up by focusing more on the protagonist, giving it a plot and some relationship development, and while the ending on its own is probably reasonably fine, for the reasons stated the manga didn't really build up to it at all, and hence it didn't really feel like it had much impact. Lastly, the art was good at times, but most of the time it was only decent, and hence not enough to hold up the manga considering the other failings.