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The universe this series sets up is one of the best you could hope to have for an action-oriented series of any stripe, and inherently creates numerous and potentially fascinating questions that the series could explore.
It then proceeds to ignore this wealth of potential and focus on an unlikable protagonist and tedious, unfunny harem antics mixed with pointless fanservice.
The series tries to mix a serious story with harem comedy elements and fails spectacularly, just like every other attempt in all of history. The action and harem elements fail to combine; instead, they attack each other. Dx D switches between a serious story and harem comedy-esque elements with an almost audible thunk, and Issei being one of the most grating protagonists Iíve ever witnessed in any medium doesnít help.
Ninety percent of Issei's personality is him being lecherous for way too long, and itís not funny or endearing in the slightest; in fact, it starts to come across as rather creepy after a while. And of course he gets tons of beautiful women falling in love with him for increasingly shaky reasons, culminating in one character literally having their entire personality rewritten off-screen and falling in love with him.
The antagonists, invariably, are about as interesting as stale bread. Most of them have little to no backstory to speak of or a believable motivation. Maybe, if Ishibumi had done something radical and spent time fleshing out said antagonists rather than wasting time on harem elements, they could be fascinating.
Combine with terrible writing decisions and a complete lack of explanation of how a lot of things work (not to mention some outright contradictions that are never given a whiff of explanation) and you have a series with enormous potential thatís basically squandered.
And this would have to be the series that attracts even worse fanfiction than usual.
TL;DR: Great universe, terrible execution.
I heard little snippets about this anime, but was never really interested in it at first. But after watching all three seasons of the anime, it turns out to be a lot more fun than I anticipated. Not many are probably gonna agree with me, but I kinda liken the series to Bayonetta: A series with lots of Camp and Fanservice on the surface, but lots of Hidden Depths underneath.
The Fanservice: Deserves its own section. The fanservice is inevitably its double-edged sword. Personally, I don't mind the fanservice. It's definitely sexy, and makes for some hilarious scenes, but I wouldn't mind it even more if the writers didn't try to force it into their fight scenes. Now, Bayonetta does this too, but it's clever enough to do this in a way that enhances the scene rather than take away from it. DxD, on the other hand, is way too blatant with its fanservice and when it inserts it into a fight scene, it causes a huge Mood Whiplash that completely ruins it.
Conclusion: If you're not a big fan of ecchi or harem anime, then this is definitely not your cup of tea. But if you're able to look past the fanservice, you'll find that it's a pretty fun series and definitely worth a look.
Disclaimer: This is for the three anime seasons of Highschool Dx D already out at the writing of this review. I also haven't read the light novels (yet?), so I am looking at the anime on its own merits, for better or worse.
I am not going to bore you with descriptions (you can read the main page yourself), so let's jump right into the middle: This series is entirely fueled by blatant and unashamed Fanservice... which is not a bad thing by itself. In fact the way the camera keeps casually focusing on the girls' naughty bits and the story taking every opportunity possible to have naked assets swinging around somehow warps the entire concept to the point where what should have been creepy and annoying instead becomes strangely endearing.
However this only applies to the slice of life and comedy scenes. There, after a while, the naked girls and nipple-shots and various flavors of consensual groping becomes part of the scenery and the reader can easily enter a sort of Zen state about it. Using the same kind of fanservice logic in actual life-or-death situations on the other hand, such as the countless deadly shounen battles that erupt during the series, is just Mood Whiplash inducing to the point of nearly ruining most of the action climaxes of the series.
That said, there is still a lot to recommend. The heroines are interesting and the lack of overt jealousy (or over-the-top violent tsunderes, if we are at that) is a welcome breath of fresh air in the onslaught of Harem Genre series produced in recent memory.
The action is also really good (if sometimes undermined by the forced inclusion of some fanservice/comedy, which tends to kill the mood of the scenes), with the protagonist being a Hot-Blooded Determinator or par with Kurou Daijuuji, with a similar penchant for spontaneous powerups as well.
Overall it is a series that gets better with each arc, has a lot of likable characters, over-the-top battles and some cute harem romance with a Harem Seeker male lead and girls who just don't mind it. The fanservice, as weirdly Zen as it can become after a while, is still prominent to the point of getting the the way of the actual storytelling, but if one can overlook that (or finds it fun even), this can be a very entertaining series.
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