Natsume Yuujinchou follows the story of Takashi Natsume, a fifteen-year-old boy with a unique and unsettling secret—he can see youkai, spirits from the supernatural world. Inherited from his grandmother Reiko, Natsume possesses the Book of Friends, a powerful tome containing the names of youkai bound to her. Pursued by vengeful spirits seeking freedom, Natsume, lacking a family and a sense of belonging, seeks refuge. His only companion is the enigmatic Nyanko-sensei, a small feline spirit who acts as a guardian with hidden motives. Together, they navigate a world of spirits as Natsume strives to release them from his grandmother's pact, blending supernatural elements with everyday life in a touching and poignant narrative.