Albert, who was reincarnated in a different world, aimed for a peaceful life in the Kingdom of Alexa. However, he was abducted by Marida, a female member of the demon race known as the Bloodthirsty Vampires, who are the strongest creatures on Earth. Moreover, he was accused of aiding in the assault and became a wanted fugitive in the kingdom. Unable to return to his original country, Albert decides to live in the Empire of Eranzia. While enjoying intimate moments with the alluring body of Marida, he uses his modern knowledge to achieve great accomplishments in governance, military affairs, and strategy. A slightly risqué harem comedy begins!