Converting Japanese E-Book in Kindle with Calibre

I have some Japanese e-books that I am reading in my Kindle (mine is Kindle 8th Generation). I use Calibre to manage file format conversion and sending them to Kindle.

However, when I send them to my Kindle, I encountered some problems:

  • The furigana embedded in the e-book are shown incorrectly. They are inlined instead of appearing on top of the kanji characters.
  • The reading layout is horitonzal left-to-right instead of vertical right-to-left.

So after scouring Calibre’s forums, this is happeneing because of two reasons:

  1. I was sending the converted e-book as “old” MOBI format which does not support those layout features.
  2. There were some extra CSS required to be injected for the reading layout.