A great painter can make a masterpiece out of anything. This is essentially what Nakamura Yuuji has done with this manga. It blends elements of a harem anime, slice of life, battle shounen, and gag manga into an absolutely beautiful story. Its opening is basically that of a gag manga, with the mystery of the supernatural situation completely undercut by the humor, then quickly shapes up to be a plain old harem manga, BUT NO! The main character, the titular Rokudou, will not allow it! In a completely character-driven plot twist, rather than live it large with his new harem of fiercely loyal delinquent girls, he instead determines to use his power for good, to achieve his dream of a peaceful high school life.

This is basically the extent of the plot. It isn't very deep, but it does not suffer for that in the least. Instead, it shines brilliantly through the amazing canvas painted by the diverse and genuinely interesting cast. EVERYONE gets character development in this series, even the background flunkies to some extent, and it just feels so natural. Nakamura uses the tools he is given, and manipulates them in an absolutely masterful way to create a truly engaging story. At multiple points I have remarked aloud to my friends just how much better this manga is than I keep expecting. It's better than it has any right to be, frankly.

The ONLY way in which I would say this series suffers is the art. It isn't bad, but it definitely isn't high-quality either. It's just passable.

So my number score for this series is as follows:
Story: 8 - This manga doesn't really have a story per se. The only overarching plot is Rokudou making the school a nice place, and the main focus of each arc is generally detached from it. These individual arcs are wonderful, however, and so net it an overall very good score. The last few chapters (I'm currently on 288) have finally presented a more concrete overarching goal, which also contributes to the score, but prior to that, it's mainly propped up by the characters.
Art: 6 - It's not bad, but it isn't anything special either.
Character: 10 - An absolute solid 10 in this department. Everyone gets an arc, and every arc is resolved in a satisfying way. Really, truly great.
Enjoyment: 10 - I have to admit I am a little biased here, though. I have a thing for strong girls, and this manga is chock full of them. I also have a thing for making interesting stories out of a premise that is in some way gratuitous, and this manga definitely, certainly does that.
Overall: 9 - I can't say it's my favorite manga of all time, but it's definitely very high quality. I would give it a 10, but I'm too conscious of my own aforementioned bias to do that. So a 9 it is.