Shen Yu is a high school student who loves vampire novels. One midnight, his older sister, the current Vampire Queen, awakens the bloodline of his past life as a Vampire Queen. He then sets off for another world to search for clues about his mother in this life.
But he doesn't find his mother. Instead, he runs into a whole group of girls he's never met before, and they insist that he was their husband in his past life.
"Wasn't I a Vampire Queen in my past life? This is all so bizarre."
The Empress of the Holy Spirit Third Empire, who has been asleep for nearly a thousand years, insists that she's his father.
The Empress of the Dragon Radiance Empire on the Far Eastern Continent insists that he was her husband in his past life, the notorious troublemaker Emperor Hunyuan.
Shen Yu never imagined that these Empresses claiming to be his relatives would be only the beginning. It turns out that his past life's followers are no easy matter either.
Like that brown-haired horse girl who pesters him every day to turn into a vampire princess and purify her bloodline.
Shen Yu doesn't mind any of this. He just wants to find his mom, his real mother: the former Vampire Queen, Hilen Karolan Cappadocia.
With the terrifying prospect of both his older sister and younger sister turning into vampire princesses and wanting to pin him down in bed, Shen Yu has to do everything he can to avoid the novel's bad ending.
Shen Yu has no choice but to keep himself looking like a human boy. But the world he transmigrated to isn't somewhere he can feel at ease.
Take just one continent in this world, for example: its vampires are divided among five countries, each ruled by a queen. And that's not even counting the vampires on the other continents.
What shocks Shen Yu even more is that in this world, there's no dividing line between technology and magic.