There are several variations of Hepburn, but none of them uses an apostrophe for small-tsu consonants. https://en.wikipedia.org/wiki/Hepburn_romanization https

There are several variations of Hepburn, but none of them uses an apostrophe for small-tsu consonants. https://en.wikipedia.org/wiki/Hepburn_romanization https://en.wikipedia.org/wiki/Hepburn_romanization