ぁ

(lengthens the preceding sound, often giving a sentence a softer or wistful tone)

→ あ
particle Rare #31,171
(lengthens the preceding sound, often giving a sentence a softer or wistful tone) An informal written form; usually appears at the end of a word or sentence.
JA: そうなんだぁ。
EN: Oh, I see.
Forms of あ
あぁ

廃墟やったよなぁ?

It was a ruin, right?

— すずめの戸締まり (2022)

彼が私と結婚さえしてくれたらぁ。

If only he would marry me...

直ちゃんのセンス 勉強になるんだぁ→

I can learn a lot from Nao-chan’s sense of style.

— 映画 聲の形 (2016)

訳してみたんだけど、合ってるかなぁ?

I tried translating it, but I wonder if I got it right.

髪形 変えたんだぁ

Oh, you changed your hair!

— 映画 聲の形 (2016)