Nube is concerned about the presence of yokai in the school to which he was recently transferred, but the students make fun of him. Then, a bizarre event occurs during class.

The school festival is approaching. Nube's class decides to build a haunted house. Nube tries to help the students, but due to Tamamo's trap, he destroys their creation.

Ritsuko worries that Miki will get her into trouble someday due to Miki's addiction to social media. Meanwhile, a black shadow that has been sneaking into the high school possesses Miki.

Nube is concerned by the student's lack of an alarm as they now know of the existence of yokai in this world. In the meantime, Izuna tries to cast a certain spell but fails, which makes Miki's neck stretched.

Akira, who cannot envision a future for himself, talks to a human anatomical model every day. The model then takes over Akira's body for one day.

Ritsuko learns Nube's secret and her feelings toward him begins to grow. That night, Ritsuko is possessed by a yokai born from a woman's grudge.

Nube is confronted with various questions, each presenting an ethical dilemma, by a monster he meets in his dream. Nube is unable to provide answers to those questions and is attacked while his psychic abilities are suppressed. Then, in reality, Nube suffers the same wounds.

One morning, a huge ground painting of the Mona Lisa appears in the schoolyard of Domori High School. A student claims that it is the work of a yokai, and that creates an uproar.

Zekki, the younger brother of Baki, transfers into Nube's class disguised as a human. Zekki's purpose is to free his brother from Nube's left hand.

The battle between Nube and Zekki leads to the breaking of the Baki's seal. Having lost the demon hand, Nube decides to fight Baki without relying on the hand.