This book is also known as "The Changelings and I Joined Forces to Conquer the Empire of Man" and "Guns, War and Medieval Warhammers"
Rosen and the yandere student Su Qingying died together. When they opened their eyes, they both traveled to the medieval Warhammer world.
Rosen became the elector of Wesenland and Nunn. With guns and soldiers in hand, he conquered the vampire counts in the east and the wild orcs in the south. Through cooperation and testing with Emperor Karl Franz, he gradually became the true uncrowned king of the southern empire.
But Su Qingying fell into chaos and became the most mysterious demon under Tzeentch - the change spirit.
She established the Order of the Deceiver within the empire, secretly planning and working step by step, just to subvert the entire human empire.
The master and apprentice who were supposed to be mortal enemies were entangled in the most twisted way.
When Rosen is in danger, Su Qingying is always the one to rush out in time to kill powerful enemies and eliminate political opponents for him;
She used Tzeentch's magic and conspiracy to give him the city, wealth and power, and threw all her paranoid and crazy love in front of him.
Just when the empire was facing internal and external troubles and was on the verge of collapse, Sylvania's vampire army was eyeing it, and the Chaos forces in the Brass Fortress in the north were ready to move. Even Emperor Karl's army was secretly destroyed by Su Qingying.
Sometimes she is an innocent girl, lurking next to Rosen; sometimes she transforms into an emperor and provokes civil war in the empire.
There are yandere demon disciples who are obsessed with madness inside, and there are vampires and chaos frenzy that are waiting for you outside, and the empire is in danger.
This time, should Rosen choose to save the empire or bring back the student who has already fallen into the abyss?
