In the shadowy streets of Lügenberg—a city where humans and demihumans coexist in uneasy peace—an unusual detective agency operates far beyond the reach of common law. There, vampire investigator Arne Neuntöte pursues the uncanny, blurring the lines between violence and truth. Everything begins to shift when Lynn Reinweiß, a noblewoman whose fascination with vampires outweighs her grasp of their danger, crosses paths with Arne. The two form an alliance in pursuit of bloody mysteries that emerge from Lügenberg's darkest corners as death and deception surface beneath the city's gothic veneer. Through each case they solve, Arne and Lynn discover time and again that truth is more elusive than what any surface can reveal.

Demon King Ahriman has a problem: his daughter, Doux, loves everyone! Consequently, Ahriman had to halt his invasion of the world in the worry that his daughter's behavior is not one befitting someone of her kind. She loves making friends, helping others, and bringing happiness to all creatures including their enemies, the humans. Ahriman, however, congratulates Doux for her good deeds instead of scolding her. With the help of his aide Jahi, who is assigned as Doux's master, the two try to get rid of her kindhearted nature—so that the Demon King's daughter goes from a cute, adorable, and nice little girl to an inhuman, cruel, and twisted little demon.

Ever since horse girl Oguri Cap left the small town of Kasamatsu to chase greater heights in Tokyo, she has rapidly gained attention with her remarkable results. Her goal to become the best horse girl in Japan seems within reach, but there is a rival in her way—another running prodigy named Tamamo Cross. However, Tamamo is not the only threat to Oguri: several world-class racers from overseas are joining the Japan Cup, pushing the renowned race's competition to unprecedented levels. With the support from the people close to her and her intense desire to win, Oguri will do anything to conquer the Japan Cup and continue sprinting for the top.

Ever since childhood, Scarlet El Vandimion has preferred to deal with wrongdoers by using her fists. However, to preserve her family's image, she suppresses her instincts and tolerates the abuse inflicted by her childish fiancé, Second Prince Kyle Von Pallistan. Only Kyle's brother, First Prince Julius, is aware that there is more to Scarlet than meets the eye, but she cares little about his growing interest. In the middle of a ball, Kyle accuses Scarlet of harassing Terenezza Hopkins, a commoner that has taken his heart. Scarlet's engagement to Kyle is nullified, leaving her outraged that all of her efforts to endure thus far have amounted to nothing. Scarlet dons her studded leather gloves, once again becoming the Mad Dog Princess. Joined by Julius and werebeast Nanaka, Scarlet is ready to give filthy nobles a taste of their own medicine—one punch at a time.