The pronounce it in a way that violates the theory of what can and cannot be pronounced in Japanese.
Then the theory is wrong. Whatever is pronounced in Japanese can be.
I don’t know if they always pronounce it “sempai”.
In Japanese, “n” regularly sounds as “m” before “p”. It’s a rule!
Then the theory is wrong. Whatever is pronounced in Japanese can be.
In Japanese, “n” regularly sounds as “m” before “p”. It’s a rule!