In the Twinbaitz Empire, the twelfth emperor, Yudding Aud Twinbaitz, is a figure of universal fear, known by the chilling epithet the Blood-soaked Fiend. His political marriage is arranged with Tenearia Ttotten, a delicate fifteen-year-old princess who is sent to become his bride. Contrary to all expectations, the young princess does not tremble before the emperor's terrifying reputation. Instead, from the moment she meets him, she finds herself genuinely and deeply in love with the large, fierce-looking man. Far from being afraid, Tenearia makes it her mission to thoroughly pamper and dote on her new husband, determined to make him happy. She actively presses affection upon him, from demanding to be carried during travel to feeding him with her own hands. However, Tenearia harbors a certain secret that lies at the heart of her mysterious past and her motivations.

Yudding, the lonely emperor feared by all as a blood-soaked fiend, slowly begins to soften under the relentless and sincere affection of his young bride. Despite his terrifying appearance and reputation, he is gradually won over by her earnest devotion. The story focuses on the gap moe between the fearsome emperor and his doting wife, exploring how their unlikely bond develops as Tenearia works to break through the walls around his heart.

The narrative follows several notable arcs that blend romance with elements of mystery and political intrigue. After their initial marriage, the couple survives an attack at the sacred mountain of Serec, an event that draws them closer together. Following this incident, Yudding publicly acknowledges Tenearia as his wife, a declaration that deepens their connection and her joy. However, their burgeoning peace is threatened by the sudden arrival of the emperor's uncle, Prutkova, whose visit signals a new wave of danger and political machination. Throughout these events, the story maintains a focus on the growing bond between the main characters, even as hints of Tenearia's secret and her special abilities, possibly inherited from her mother, begin to surface, adding a layer of mystery to the otherwise sweet and comedic romance.