Immersed in thoughts of revenge for his parents, Kimokawa Tanbei was walking down a city street on a gloomy, rainy day. His attention was drawn to a pretty girl sitting on the ground. She was completely naked and had a wound on her leg. Drawing attention to her beauty and lush breasts, he was just about to undress and was about to get down to “business” when someone hit him on the head. Later, after an encounter with the bandits, the same girl saves him. And as it turns out later – she is Betty Valentine, the princess of the demonic world. Having fallen in love with each other they decide to live together. However, the demons of the world of darkness cannot allow such a couple to exist.