Natsuki is the top female karateka in her high school. Beautiful and cheerful, she charms most people she meets. Most of the young men in her class would dearly like to be the object of her affection but she saves her passion for karate. Unfortunately, all the big ugly thugs she comes across want to fight her so she's always finding practical application for her karate skills. As the series continues and her opponents get grimmer, Natsuki learns techniques from Akido and Judo and develops a special Ki energy blast that doubles the strength of her punches. She may not be able to smash walls like some of her opponents but her special N.G. Bomber usually sends her opponents flying. (Source: AniDB)

Takashi Natsume and his spirit companion Madara, nicknamed Nyanko, continue returning the names of spirits from the Book of Friends given by his late grandmother Reiko Natsume. On his way back from school one day, Takashi encounters a lurking spirit named Monmonbou, who recalls memories of Takashi's grandmother after hearing his name. Takashi's natural curiosity leads him to explore a mysterious town where his grandmother used to live. Befriending her old acquaintance Yorie Tsumura and Yorie's son Mukuo, Takashi unveils more of his grandmother's past. In the meantime, Nyanko detours for food and stumbles upon a suspicious Spirit Seed, which miraculously sprouts into a fruit tree overnight. Giving in to temptation, Nyanko consumes the fruit, splitting him into three. Seeking a solution to Nyanko's predicament, Takashi and his friends lend a hand, unexpectedly uncovering more secrets the town holds in the process.

Ishi Okoshi While searching for Nyanko-sensei, Takashi Natsume encounters meek and small-looking youkai Mitsumi. Mitsumi was entrusted by his leader Gantetsu, a powerful and strong ayakashi, to be the year's Ishi Okoshi, whose role consists of waking him from his deep slumber. Seeing how much Mitsumi wants to prove himself as Gantetsu's worthy servant, Natsume decides to help him fulfill his task. However, time is running out—for they are not the only ones who want to awaken the divine being. Ayashiki Raihousha One day, Natsume's friend Kaname Tanuma is visited by a strange man. In the subsequent days, the visitor briefly talks with Tanuma and leaves. Natsume soon discovers that the outsider is a youkai disguised as a human, who claims to bear no danger. Despite trusting the youkai, Tanuma's health slowly begins to deteriorate, causing Natsume to become more suspicious of the interloper. What is the truth of his sudden appearance and his connection with Tanuma?

As the first delicate snowflake touches the cold ground, Nyanko-sensei dozes on his hot-water bottle next to Takashi Natsume. While his aunt prepares a warm dinner, Natsume takes a walk, welcoming the snow and the chilly weather. However, his peaceful promenade is disturbed by a white, fluffy snowman yokai with perturbing black eyes, searching for something warm and sparkly. With no further information, Natsume sets off to help find what the spirit desires.