I read the first 6 or 7 chapters out of curiosity and... it was disappointing.
First, the prologue chapter sets up the MC getting captured and turned into a (female) vampire but then the very first chapter after that is a big timeskip where he apparently became some sort of vampire general, led troops, and then escaped back to the human world so... if you were intrigued by the 'vampire princess' premise, don't bother, that stuff all gets thrown in the past with a timeskip.
blah blah blah, some boring human world stuff happens, MC feels he's been "disgraced" and can no longer be a Knight after living as a vampire, he's scraping by and dirt poor, typical MC stuff. Later his first transformation sequence happens, and apparently the vampire princess is actually a completely distinct character from MC? She refers to him in the third person and criticizes his decisions, so they seem like two distinct characters... sharing one body...
So I sorta lost interest because of that. I feel deceived by the synopsis and cover art!