"A flower blooms in the world that's only filled with thorns..."
Young lady from London, Katherine O'Sulivan, on her way to Cardiff, where she is supposed to marry a much older man she doesn't know nor love, is attacked by vampires. Thankfully she is saved by the count Shiro Akira, who however is also a vampire, but the pure blooded one. Katherine, unable to leave the count's mansion, slowly starts to discover a whole new world that she had no idea existed, hating at first, but in the end falling in love with the pure blooded vampire who saved her, and what's more - with reciprocity.
But will Shiro's strict world accept their love? And won't the approaching great danger separate this pair of lovers?