v5p4 25% By defeating the Infernal Demonic Beast Haagenti, the empire had at least gained access to a painful plain that it could now develop. -> plentiful?

a1v7p18 ~16%

They know that if he were [...]

Should be knew.

~86%

Two pairs of eyes turned toward Ryo.
Both belonged to a white-haired man [...], and another man

"Both" should probably be "They" here.

v18p5:
74%: Yes, Your Jrace -> Grace

v3p11 ~19%

" I apologize [...]

There's an extra space after the ".

~22%

[...] bright red once more.I couldn't [...]

~31%

[...] I smiled at him."Thank you [...]

Both missing a space after the period.

~34%

[...] learn how to smile, Much to [...]

The comma should probably have been a period.

~44%

[...] and resuming working.

Should probably have been "and resumed working". That being said, technically "being reminded about [...] resuming working" could work, but it's not nice to read. I guess "and resuming work" would be an alternative.

~47%

[...] way closer to us "Please, raise [...]

Looks like it's missing a period after the us.

~59%

[...] she said softly. I fear for the future.

Is missing the opening " before "I fear [...].

~78%

"'Just because,' you say?

Is missing the closing ".

~81%

[...] startled my father. [...] made my father become tense.

Maybe replace the second "my father" with "him"?

~84%

Naturally, Mer happily got on his back and had become very hyper.

The times of "got" and "had become", connected with just an "and", feels off.

Volume 5 - Part 2:

[72%]

"You are Patriarch ALdera, correct?"

ALdera > Aldera

v2p11 ~94%:

Pillars of fire shot up from beneath his feat

feat -> feet

V5 P1, 30%
"Reina was dextrous, so she could do anything, but she had said that Zelos was bad at it."
Seems both dextrous and dexterous are valid spellings, but with the latter being more common thought I'd make a note just in case.

While I'm noting things:
45% “This island is relatively untouched by human hands, and yet there are surprisingly many artificial things here.”
Seems a little definitive for someone with amnesia. Perhaps is -> seems (unless this happens to be a slip/foreshadowing and she knows more than she's letting on, or her subconscious coming through)

64%
"The three of them had apparently gotten stronger lately and could beat some monsters now, but when their enemies got to the rank of rabbits, they still struggled unless they were ready to sacrifice themselves to take down their foes."
This could well be me being dense, or just simply forgetting previous events, but what on earth is 'the rank of rabbits'?

V5 P11, 60%
"As commander, I could easily order Pickle or even Jaffar to martial the concerned knights in my steed"
Steed -> stead

V10 P8 ~89%

How dare. Such an accusation wounds me.

Incomplete first sentence.

V10 P12, 20%
"Even under the discounted military pricing, boot camp sessions cost thirty thousand dollars each. There probably weren’t many people out there like Team Simon who could push through the full eight rounds, but a good number could manage two or three. So from that point of view, in terms of value, the rings would be worth possibly fifteen thousand dollars at most."
Just checking, is this value in dollars, or yen? Of course they could be switching between two currencies (just earlier: "plain silver rings... five thousand yen or less", but I think it more likely (and easier to follow) if they were just using one or the other.

V1 P5, 89%
"Above us was an enormous firedrake, with arms as large as trees. Its tail, covered with arrowhead-like spines, writhed like a snake."
Spines to spikes, methinks. (Unless it's meant to convey arrowhead like spikes running up its spine, and I'm misreading it?)

Volume 8 part 4 53%

They exploited their people, imposing heavy taxes to enrich himself.

The pronouns don't match but appear to refer to the same subject, one should change. Based on context it should probably be themselves instead of himself, but changing they could make a grammatically sensible sentence.

v14p1:

38% - “[…],” said Haruka. “But I hope we never find ourselves in such a.” -> Has Haruka just been interrupted by Nao (if so, “uh oh”), or are we missing a word or words here? I would expect different punctuation if she’s been interrupted, so I’m presuming that it’s missing dialogue. “… in such a situation.”? “… in such a spot of bother.”? There are probably plenty of options to finish the sentence.

v4p6 ~57%:

The Five Sages ranked along kings and emperors

along -> among

v1p5:

33% - You plan -> Your plan

V10 throughout i.e. part 8 63%:

Camellia has been used constantly when referring to events in Hydrangea, as well as the events that actually took place in Camellia. I don't know if the issue is with the original or confusion from the translator, but it's very confusing to the reader.

@Shiroi-Hane Yeah "revive' would work too.

V13P4

50% Its "trunk" (if you could call it that) was pyramid-shaped and there was a glowing gem set where its belly button should be. -> While not technically wrong, the more common term would be 'torso', no?