Haha, I think there's nothing more about the princess because Rayflo's past also wasn't entirely revealed....
I guess （￣へ￣）well she was a bit of a bitch anyway xD
It was THE princess of the kingdom he was serving before becoming a vampire. I'm guessing something happened and she turned without Rayflo's knowledge and somewhere along the way he discovered and put her to sleep. maybe.
╮(￣▽￣)╭Tho it didnt matter and the plot just kept going fine hahahaha
hahahaha I know right? it was like BOOP who cares ╮(￣▽￣)╭
they made a big fuss about the princess at th beginning but then nothing XD I'm really confused hahaha LOVED this manga read it through one night istead of sleeping XD