"Call of the Night" centers on Ko Yamori, a 14-year-old boy who struggles with insomnia and a growing sense of disconnection from his daily life. One night, he wanders the streets and encounters Nazuna Nanakusa, a mysterious and carefree vampire who offers him an escape from his mundane existence. Intrigued by her nocturnal lifestyle, Ko begins to explore the night world under Nazuna's guidance, discovering a hidden society of vampires and humans who coexist in the shadows. Nazuna introduces Ko to the concept of becoming a vampire, explaining that he must first fall in love with her to complete the transformation. However, Ko’s feelings remain ambiguous, and their relationship evolves into a complex dynamic of mentorship, companionship, and mutual curiosity. As Ko delves deeper into the night, he encounters other vampires, each with their own philosophies and struggles, as well as humans who are drawn to the allure of the night for various reasons. The narrative explores themes of identity, belonging, and the search for meaning, as Ko grapples with his desire to escape his human life while questioning whether becoming a vampire is truly the solution. Nazuna, meanwhile, is revealed to have her own vulnerabilities and a past that complicates her role as a guide. Their interactions are marked by humor, tension, and moments of introspection, as they navigate the blurred lines between human and vampire existence. The series balances episodic adventures with an overarching exploration of its central characters, blending supernatural elements with a coming-of-age story. The night itself becomes a character, symbolizing freedom, mystery, and the unknown, while the relationships between Ko, Nazuna, and the other characters drive the emotional core of the narrative. Through its exploration of the night and its inhabitants, "Call of the Night" presents a unique take on the vampire genre, focusing on the emotional and existential struggles of its protagonists.