The main issues with this manga is that it has no clear direction. The author intervenes whenever necessary and assumes that the reader will just follow suit. It started really good with him getting his new power but the chapter after he got an OP weapon. From that point on he just became ridiculously OP. That aside he had no goals if not serving the fl. Problem is we only saw like 2 interactions of them so for the mc to be totally infatuated with her make absolutely no sense. He now wants to devote his life protecting her like what? Before meeting her didn't he have any goals he wanted to accomplish?
As if it wasn't enough the author shove into our throat the whole deadly sins plot. All of that mc is just following whatever comes in front of him without a clear goal. This is not how you write adventuring stories. Mindless killing for the sake of it. And all of the stats are broken, you see monsters with 100 millions stats point but it doesn't seem like that country has so much manpower, it should have been destroyed already. Coming back to the sins stuff. Advice for authors, don't write stories where you have some kind of big conspiracy with someone controlling everything from the side. It removes any sense of importance and lower the value of it all. Now someone new the mc had power and observed him and basically chose his fate, that means that he doesn't control anything in the story. And that makes your mc weak. rant over.
Absolute fucking garbage some panels are very inconsistent, they try to make the main character badass while he's the exact opposite and there are quite a few of annoying cliches
This series starts as an action fantasy, but it gets all over the place with the story. The power scale is complete clusterfuck. It’s so ludicrous at one point an “E zone” is introduced. It means the stats go over the 999999999 points where exponent notation is used instead. It reminds me of cookie clicker, but applied on shounen power levels. I gave up on the numbers long before that point given the main character starts at usual values around 100. Speaking of the main character he could be classified as typical disregarded shounen protagonist, who suddenly discovers his hidden power. It’s at this point quite overused skill of absorbing other skills from enemies usually after the MC defeats them. This time with additional ability to absorb all the stats as well. It has drawbacks, which turn to be not so serious in practice as it might be suggested initially. Mainly necessity to kill like for a vampire, who doesn’t drink blood, the thirst otherwise becomes unbearable. It was an interesting idea, but it never had any serious consequences as far as I can remember.
Fights are enjoyable, but usual shounen tropes apply, and there are a lot of them , except bit more gore given it is seinen*.
Characters are rather typical, but enjoyable still. If this ever gets anime adaptation, most people are going to be interested more with Myne, girl with the axe, or Aaron.
Visually the series looks ok.
Overall, I think this series is rather average.
Japanese difficulty 5/10 (see my profile for details about various difficulty scores)
This series is classic seinen without furigana except for introducing people. It isn’t suitable for beginners.
This review is written after reading 8 volumes (all existing at the time).
* Japanese bookwalker has tagged it as seinen
 For an example it goes or at least hints predictably the seven deadly sins trope. Obviously, the MC is gluttony.
In 2 words: Quite enjoyable
One of your usual manga where the bullied mc (name: Fate) discovers he has the power to devour his opponent's skill and become OP. Since he has someone he wants to protect, he can now become OP by mercilessly killing monsters for her sake, Perfect!
I'm exaggerating a little xd, I decided for once to support the mc in his romance, which may not be exceptional, but good enough and cheering for a character for his love to succeed is quite fun.
It's true that a lot of things don't make any sense whatsoever, the characters you think are strong aren't, the OP monsters that seemingly don't do anything else aside from being xp for our mc, the plot that isn't clear:
I kinda liked that the character could accomplish his revenge fast, but it's not a revenge manga, so stopping the revenge plot and adding it again as the main focus can become annoying in the future. I say that but it also adds a new obstacle to our OP mc, so it's not that bad.
Some other things are interesting,
1. Fate isn't op everytime and makes some choices (which doens't change much at the end of the day but can surprise you, in a good way)
2. the drawing is nice
3. the villains are unimportant
The manga doens't start original and doens't become original, it's simply a manga with something more than others.
When this manga started it was really exciting but as the story goes on it gets weird and i would say the reason for this manga not being as good as it could is that it diverts from the story it was first following that was so interesting but the main character is pretty cool and there are some interesting waifus.
so to sum it up, good start but it kinda falls of, good characters but the art is decent 6/10.