I've heard the following exchange between two characters, where B agrees to do
something dangerous that she previously was dead-set against but chooses to do
so now of her own volition:

> A:「いいんですね？」
>
> B:「構いません…」 <pauses for a couple of seconds, then looks even more decided>
>
> B:「いいえ、構わない。この子は絶対に無事に地球へ返す。その為に必要なの。」

If it were just simple emphasis, B could just have repeated the first form
with two different vocal/facial expressions, but the fact that there are two
distinct forms of 構う makes me think that there's a fundamental subtext that
I'm missing, other than one being a more "polite" form. Can someone enlighten
me?

* * *

**EDIT:** Added some more context, though I'm not sure how much is enough. B
is ヴィヴィ, and A is マツモト, from Episode 3 of [ヴィヴィ
-フローライトアイズソング-](https://myanimelist.net/anime/46095/Vivy__Fluorite_Eyes_Song),
around 7:45 (hopefully the timestamp is consistent between streaming
platforms).

She generally uses a respectful tone, is very mindful of others, and almost
always uses polite forms e.g. 〜ます, as well as expressions like させて頂きます /
auxilliary verbs like おります that I associate with polite speech (is that 敬語?).
The switch to a less formal expression is very sudden and coincides with a big
decision on her part.
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2021-04-18T20:12:57.817
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2021-04-19T17:47:51.170
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question
nuances
Difference between 構いません and 構わない
Without proper context, it is difficult to say, but it seems to me that a
female character B said in her normal formal way "構いません" for the first time,
but after reflecting (represented by the use of ...) on something dangerous
she was going to do, she said again the same thing by using informal or
impolite or manly phrase "構わない", in order to get it compatible with something
dangerous or evil, or to express her strong decision or will.
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2021-04-19T04:51:34.973
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answer