Ep. 1: Shido faces Natsumi's impersonation scheme targeting twelve people close to him.

Following a hot pot gathering with spirits, Shido and the Fraxinus crew encounter a new spirit named Natsumi. Initially friendly, she abruptly declares her intent to ruin Shido's life and departs. At school, Shido is accused of various offenses by classmates and his teacher. He discovers that Natsumi disguised herself as him to damage his reputation. Before she can attack, Touka and Origami intervene, correctly identifying the real Shido and forcing Natsumi to retreat. Later, Kotori delivers a letter from Natsumi containing photos of twelve individuals close to Shido. The letter states that Natsumi has disguised herself as one of these people and challenges Shido to identify the imposter before all of them disappear.

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