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I know the `んだ` form is used to give and ask for explanations, but I'm not
sure about its usage in this passage; context: a girl asked a boy how much he
loves her, he answer and then starts explaining his answer:

> そして僕は突然、自分が知っている誰からも、自分が知っているどこの場所からも、信じられないくらい遠く隔てられ、引き離されている **んだ** と感じる

It seems like an explanatory usage of `んだ` and it makes sense, since he is
giving an explanation; I'm not sure because that sentence is just part of the
explanation the boy gives, and before and after `んだ` is used just another time
(in a `なんだ` form). So I was wondering: why that sentence uses `んだ`, while the
rest of the explanation doesn't? It's like the character felt the need to
stress that part?

For reference, some more of the explanation (if needed I can copy also the
following part):

>
> ある時、夜中にふと目が覚める。正確な時刻はわからない。たぶん二時か三時か、そんなものだと思う。でも何時かというのはそれほど重要なことじゃない。とにかくそれは真夜中で僕はまったくのひとりぼっちで、まわりにはだれもいない。いいかい想像してみてほしい。あたりは真っ暗で、何も見えない。物音ひとつ聞こえない。時計の針が時を刻む音だって聞こえない―時計はとまってしまったかもしれないな。そして僕は突然、自分が知っている誰からも、自分が知っているどこの場所からも、信じられないくらい遠く隔てられ、引き離されている
> **んだ** と感じる
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2019-09-30T10:31:02.560
72186
2019-09-30T12:17:49.760
35362
question
grammar
Is this ~んだ form an explanation?
Yes, this んだ is an explanatory-の followed by だ.

In this paragraph, the weird situation that needs to be explained is 誰もいない,
何も見えない, 物音ひとつ聞こえない, etc. In other words, these are treated as "questions"
rather than explanations. And the corresponding "explanation" (or "answer") he
suddenly noticed is "僕は誰からも、どこの場所からも引き離されている".

  * 何も見えない。 物音ひとつ聞こえない。  
→ I can see or hear nothing. (Why?)

  * そして僕は突然遠く引き離されている **んだ** と感じる  
→ I suddenly noticed I'm separated from everything I know! (And that's why I
can see or hear nothing!)

By the way, is this whole thing really an answer to "How much do you love me"?
Then you can forget that context for now. Obviously, saying 引き離されているんだ does
not serve as an explanation to her question. He has started a long story which
seemingly has nothing to do with their love.
CC BY-SA 4.0
2019-09-30T12:04:50.967
72189
2019-09-30T12:17:49.760
2019-09-30T12:17:49.760
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answer