Where does “Nあ~” come from??
“N” comes from JLPT. In JLPT, there are 5 levels : from N5 to N1, but we created “Nあ~” level on the top. “あ~” is a typical Japanese response in a conversation.
So Nあ~ level means native level not only in vocabulary, reading, listening or speaking but also in local cultures, how to behave like Japanese.