Story is in indefinite hiatus and might never get updated again. Shame that it never reached R18 of Rei.
Let me be clear, I like this novel a lot. Very much so. But I still have several issues with it. The best way to describe it, is that it is very *******ish. It is covered in dirt but I know it is a diamond underneath all that dirt.
Now then, on to the review.
Story has promise but lacks direction and focus, pacing is too fast, author's writing style is condescending and chaotic, MC is a bad edgelord, far too many "original" concepts that ruin MHA world and restrictive(small) harem imo.
TL;DR about sums what I think, but I still want to rant.
Lets get this out of the way. The pacing is atrocious. The novel is moving too fast that author doesn't really do all that much in fleshing out the world and circumstance our MC is in. It's basically one plot point onto the next. The result of this decision was the lack of information about what was happening with the MC in general. While this is not bad in most cases, it became a norm and it feels like the MC is a walking Deus Ex Machina. Which leads us into the next point.
Author's writing style is very vindictive and condescending. This is because rather that me thinking that Kuroha was the one thinking of this things, author writes it as such that it was as if he was being informative and stating a fact. I really wasn't expecting to get lectured when the first R18 scene came about. I am not attacking author personally but I do disagree with a lot of the things that was stated in the novel, specifically about love and morality in general. Finally, the author uses cliffhangers a lot, and I mean a lot. From what I read in the comments, he does it because he "felt" like it which while funny for a few times, it simply becomes irritating after a while. His community is very nice in general, I don't get why he just doesn't rant in discord or in the Author's note but I digress. This type of storytelling hurts the story more than anything else.
Now, let us talk about the story. Because of all of the above aforementioned, story has suffered very much. Lack of information being the main issue. From what I gathered author likes putting up more information in his discord which is pretty bad storywise. Not knowing something, then being shown that a certain character can do this while author saying he hinted it sometime ago makes me question my reading comprehension, which is perfectly fine since it only happens when I read stories which lacks foreshadowing or small hints. The beginning of this novel suffers even more since the only thing that is supporting it was that it was in the MHA world. I mean, come on, the MC was sold at the age of 4 and was treated as a lab rat. His mental functions are suppose to be like a vegetable. I highly doubt that the scientist would have given him some books to read or any knowledge in general aside from following commands like a good lab rat. MC was actually said to be kidnapped at the beginning but was retconned to actually be sold by his parents. No foreshadowing, I mean, we had a 4 year time skip that describes what happens to MC in like 3 paragraphs with about 10 to 12 sentences max. The beginning was extremely bad, the author simply added more stuff into MC's backstory to make it look cool. Which is the reason why I like this novel even if logic fails and plot holes are aplenty. Author seems to think otherwise from some of his quips since he also likes to break the 4th wall from time to time. This story is not comedy, so it really breaks the flow whenever he does it. And he does it a lot.
It is time for our MC, Kuroha Hayate or Swift Revenge for extra egdyness. Simply put, he is an edgelord. The bad kind. He is the emo with a dark past that emotes every now and again. Add in the fact that he manipulates his blood as his power and cuts himself to use said powers, we got ourselves the wet dream of edgelords. Of course, when the story needs to, he stops being his edgy self and becomes a self aware harem protag. But he is still beta enough to be the "yare yare daze" guy, being troubled in being to popular. Did you know our MC is "broken" and "complex"? No? Well, author likes to state it as such. Never really written how broken or complex he is. For the author, the MC is broken because his moral compass is broken. But we are shown time and again how normal he is. He doesn't like to inflict pain unto others, even the scum of the earth. But he would still do it to uphold his morals and convictions which is pretty normal if you ask me. And MC being complex? He has 3 other "personalities" that author has decided to use elsewhere. The other 3 don't even take control, other than 1 instance, he just has 3 other personalities. Completely trash. From what I understand, he more or less tried to copy Mutagen and failed, which is understandable since it is pretty hard to pull off.
Speaking of OCs, this story has a ton of them. Most of the original cast are cast aside for author's OP OCs to take center stage. No joke, most allies and enemies are mostly OCs that can take MC down easily. Almost all OCs that exists in this story are more powerful than the original cast. Even All For One is trash compared to his "Joker" level OCs. Most of this OCs begs the question of how AFO never stole all their quirks? He can steal ALL quirks, only One For All is immune to it so how in all hell can anyone get stronger with a monster like that watching over Japan, and by extension the whole world. AFO dominated Japan society, selling quirks for "favors", I highly doubt influential people across the globe didn't flock to his side when they heard of him. Author says that it is because of ANOTHER OC/Group so powerful that everyone has to listen to them. Said group has no such foreshadow at from the past 100+ chapters. Aside from that, author even quips in the story that people who judged a power to be overpowered lacks courage and imagination. Oh, I'm sorry for being a reader that was only given a set amount of information with no control of how the story goes. I'm sorry for still thinking it is OP as hell, how can something that nulls, oh wait, author "clarifies" the quirk on what it really does. It "weakens" a quirk that renders it useless so long as they are inside a certain radius from said OC that ranges from several kilometers if given enough preparations. Oh wait, it doesn't effect mutant type quirks, silly me. Being only be able to nullify 2/3 of the basic type of quirks makes it so much more balanced. Yes, I hate that quirk so much and much more the reasoning on why it isn't OP. People aren't stupid author. Being able to nullify someone's power is OP, that is why most of the time, it has the stringiest requirements, some of which is it being time based or being easy to resist.
And finally, we come to the harem and the R18 stuff. Frankly, harem is the same as any other story. Heroine falls in love in 1 or 2 chapters even thought author says they would have a "long" time to grow closer. Only, we don't actually get to read them getting closer. We simply have timeskips here and there to the important bits and blamo the girls love MC. But author only has 5 harem members which is to small imo. I don't mind fast romance, since it is far more realistic than love stories. What I do hate is the author naïve view of relationships in general. It's bad advice in saying that being handsome, successful and rich won't get you women because it will and they would come by the dozen. Finding a lifelong partner on the other hand, is pretty hard in general, there is absolutely no advice anyone can give other than trusting yourself, your own experiences and living with the consequence of it. Finally, with the R18... the last one was the greatest while the other two was... preachy and arrogant. When I was expecting lemons the weird paragraphs about how to do this, or how to do that came. It wasn't really good. Thankfully, author didn't write his opinions on the last R18 and as a bonus the intercourse was longer than the damn foreplay.
If you read through here, congrats, you just listened to me ranting on how much of a rewrite this novel needs imo. In any case, it is still pretty good novel, it just needs more fixing.