Needless to say, authors can't always write what every reader wants to read.

Even ifthough I realize this fact, I sometimes want to criticize them for not including what I want them to describe in detail or including what I don't want to read.

Recently, I can't make up my mind if I have to buy Light Novels of "Monogatari series"should buy the "Monogatari series" Light Novels, which have been released in English.

This manga series areis also very popular amongin foreign countries and you can find good reputationviews on Amazon.

You could also say
>This manga series is also very popular _abroad_
Or
>This manga series is also very popular _among foreign fans_

However, I don't like some part filleds with sexual harassment enough, so much so that I skipped these scenes when I watched the anime series.

Reasons why I want them are not only for learning English but also for the cover illustrations.

These illustrations are absolutely stunning and are designed by VOFAN, who is a famous Taiwanese illustrator.

Needless to say, authors can't always write what every reader wants to read.

present indefinite and needs an 's'

This manga series are also very popular among foreign countries and you can find good reputationviews on Amazon.

reviews is a better choice here

However, what I don't like are some part filled with sexual harassment enough thats which contain nudity and I skipped these scenes whenever I watched the anime series.

Reasons why I wantread them are not only for learning English but also for cover illustrations.

Needless to say, authors can't always write what every reader wants to read.

"Every reader" is 3rd person of singular. The conjugation of the verb"to want" in the 3rd person of singular is "wants".

Even if I realize this fact, I sometimes I want to criticize them for what I want themse authors to describe in detail or what I don't want to read.

"Sometimes" is the connector of the two clauses"even if I realize this fact" and "I want to criticize them". So put it first, not the I. Also, don't repeat the word "them" in the same phrase. It makes the phrase harder to understand and this practice is also ugly writing.

This manga series areis also very popular among foreign countries and you can find good reputationviews on Amazon.

The compound noun "this manga series" is singular. If you don't believe in me, substitute it in your text by "this single manga series". Single from singular. Use is, not are. Also, reputations does not fit well here. Use reviews.

However, I don't like some parts that are filled with sexual harassment enough. So much to the point that I skipped these scenes when I watched the anime series.

This makes the text clearer. Also, scenes and parts must be plural. "Some" when used with anything, is always plural, unless you don't know about the thing very well. In this context, never "some part". Always "some parts".

RThe reasons why I want them are not only learning English but also the cover illustrations.

Helps the readability of your text and also it is grammatically more correct.

These illustrations are absolutely stunning designed by VOFAN, who is a famous Taiwanese illustrator.

don't forget the articles! "A" is important!