Plagued by chronic insomnia, a restless middle school boy named Ko finds himself drawn to the nocturnal streets, where he encounters a captivating vampire named Nazuna. She offers him a tantalizing escape from his monotonous existence: the chance to become a creature of the night himself. However, the transformation requires something far more intimate than a simple bite—he must fall in love with her. As Ko begins to explore this new, shadowy world alongside Nazuna, he discovers a vibrant community of other vampires, each with their own unique quirks and philosophies on eternal life. This dark romantic comedy, featuring the voice talents of Gen Sato as Ko and Sora Amamiya as Nazuna, blends a moody, atmospheric setting with playful, heartfelt moments. The series delves into themes of loneliness, belonging, and the search for personal meaning, all while Ko grapples with the seductive pull of the night and the genuine feelings he starts to develop for his enigmatic guide.