Kaguya-sama: 女の子 (onnanoko) as an opposite for 男子 (danshi)?

Question

Related: Kaguya-sama: Dropping keigo when narrating?

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In Kaguya-sama Chapter 52 / S02E02, there's a character named Moeha Fujiwara (the imouto of a main character Chika Fujiwara) who talks about Kei Shirogane (the imouto of the male protagonist Miyuki Shirogane) to Kaguya Shinomiya (the female protagonist and title character) as follows:

圭ちゃんかわいいよね？

ウチのクラスの男子は勿論だけど

女の子からもすっごくモテるんだよ。

In manga:

In anime:

See 0:11 - 0:18 here.

Question 1:

Actually, I didn't fully read up on the differences between onna vs joshi and shounen vs otoko (so far I just think of them as the difference between man vs boy vs male or like naturally vs of course [touzen / tōzen vs mochiron?]), but I believe the analogues / antonyms are as follows:

male	female
otoko	onna
otokonoko	onnanoko
N/A	otome
danshi	joshi
dansei	josei
shounen	shoujo

Why is Moeha seemingly using 女の子 as an opposite for 男子?

Question 2:

Btw I notice 'ウチのクラスの' is removed in the anime. Is the only difference 'in class' like Moeha in the anime says Kei is popular with boys (not necessarily limiting to a particular class or even year) ?

Answer 1

･Answer 1

Both 女の子 and 男の子 have a cute nuance. But both 女子 and 男子 have a little curt nuance.

In Japan (although it may be similar in other countries), adolescent girls tend to despise boys a little. If you want boys and girls to line up in parallel, you should use ”男子 and 女子” or ”男の子 and 女の子”. But, in this case, She wants to make the difference between boys and girls for the reasons I just mentioned. So, using 男子 and 女の子 would be appropriate.

･Answer 2

You are right. However, I guess the reason why the expression is different between manga and anime is not only depends on the meaning, but also depends on the limitation of airtime.