It appears that a publisher in Japan has contracted with Harlequin to manga-ize (is that a word?) some of their older novels into graphic novel format. They appear be doing contemporaries mostly, however they've announced a first dip into historicals with The Devil Earl by Deborah Simmons. No idea on release date yet.
You can see samples of previous ones here. Be sure to scroll across the panels - one in each scan has an enlarged version.