I would say it is pretty much Shounen done right. Characters do not throw angsty fits, do not preach mid battle, there are plenty of comedic episodes inserted into the story, and fights do not last two episodes. Animation is quite fluid, even though art style is somewhat simple. There's nice music, and the whole thing feels believable, or even touching at times. It is much, much, much better than I expected.
Detailed breakdown below:
Story - it is fairly simple/straightforward story about a school boy getting powers, meeting a companion and then fighting enemies. However what sets it apart is light-hearted handling of many scenes, many nicely done comedic moments. I would say the story finds just the right balance between drama/fights and slice of life elements. Rather than plot devices characters look like actually believable people, and for most of the time events that happen sorta make sense. So, while the story is relatively simple, straightforward and even stereotypical, it is quite pleasant to watch.
Art:
Art is quite simple, however, the animation is of high quality. Even though characters have fairly low amount of detail, they move very fluidly in most scenes. There's some CG that doens't *quite* match the 2d art, but it is tolerable enough.
Sound:
Music is generally nice, and opening theme is entertaining. The ending of the second half is interesting to listen to. It is not very memorable, but it works to complement the story. I would say it is slightly below the level of music in Keijo (where musical part was done perfectly.
Characters:
There are three or characters total that pull this anime through and make it memorable. Those are Tokiko, protagonist's sister Mahiro and one of the initial bad guys (with very interesting fashion sense). Tokiko is just plain adorable at times, and rather easy to sympathize with. As far as I can tell, she is supposed to be an archetype, but in the end rather than archetype she looks like a person, plus seiyuu did a great job voicing her. The second important character was mahiro, who mostly works as comedic relief, and even though does not really have much of a character on her own, she does a great job adding comedy when she arrives. And then there's bad guy with strange fashion sense....
In comparison to strong female lead, protagonist himself is rather generic "shounen good guy protagonist". Thankfully he isn't spineless, isn't perverted, doesn't preach too much, isn't prone for fits of angst, so for this kind of anime the character works quite well. However he is not very memorable by himself.
Enjoyment:
I liked first half a bit more, since it had more of light-hearted episodes. The 2nd half for a while looked like it is about to devolve into standard cliched anime with drawn out fight, but it narrowly dodged it. Overall first 12 episodes were definitely more interesting for me.
Overall:
It is interesting to watch, mostly because of female lead and light comedy that often pops up across the series. The art is a bit low on detail, but it is compensated with very fluid animations, which makes the whole thing much more entertaining. Decent music, great voice acting on main heroine, and even though it is fairly cliched, the story was not boring.
I'd recommend to check it out, if you have the time.
