In a quiet and magical village, Natsume Takashi continues to grapple with his peculiar gift: the ability to see spirits and youkais that hide in plain sight. After a series of emotional and often nostalgic encounters with these beings, Natsume finds himself at a crossroads. While he strives to make his everyday life as normal as possible, his connection to the supernatural world does not wane.
Things become more complicated when Natsume receives a mysterious book that belongs to an ancient youkai forgotten by time. This book not only contains secrets about Natsume's past but also reveals dark events that could disrupt the fragile balance between humans and spirits. As he delves deeper into these new revelations, Natsume feels overwhelmed by the responsibility that comes with his discovery.
With the help of his inseparable friend Madara, a cat-shaped spirit, and other unexpected allies, Natsume must unravel the hidden secrets and discover his own place in this magical world. The search for answers will lead him to confront not only the ghosts of the past but also his own identity and the true meaning of friendship. In an emotionally charged journey, Natsume will have to choose between his duty to the spirits and his desire to live a normal life, all while learning that the bonds we forge can be as strong as blood ties.