I don't care how it may be pronounced or enunciated, it should still be an n lol. it's not as if it's written せむぱい (which would be artistic license to create an original title, this is merely a translation). There are many different regional pronunciations of english (generally stemming from uncorrected speech), but they all only have one written form in Japanese. It does not change based on accent (ie. how it is said). Rant over, ignore if desired. My apologies if it is repetitive.