That Which You Must Not Call

That Which You Must Not Call
Name
Kanji	呼んではならぬ
Romaji	Yonde wa Naranu
Information
Air Date	February 16, 2009 (JP) January 1, 2023 (US)
Episode	20
Adapted From	Chapter 18
Opening Song	Ano Hi Time Machine
Ending Song	Aishiteru
Episode Guide
Previous The Maiden's Circle	Next Emotions Undying
List of Natsume Yuujinchou Episodes
Episode Gallery

That Which You Must Not Call is the seventh episode of the second season and the twentieth episode overall of the Natsume Yuujinchou anime series. It first aired on February 16, 2009.

Summary

Natsume is dragged off into the cave of the evil spirit that is after Tooru. He temporarily loses the ability to see youkai after being poisoned by the spirit. Will he be able to stop the youkai from eating Tooru without his sight?

Plot

The episode starts off with a recount of the previous episode, Natsume disappears and his friends look for him.

Natsume is lying on the floor of a cave with a rope around his neck. The Stitch Mark Youkai licks his eyes to poison Natsume as Natsume breaks free and runs from the cave. He crashes into Madara as the group look for him. They crash down a slope.

Natsume rubs his eyes as he finds out he can't see youkai. Madara gets angry at Natsume and yells at him for a long time. Both Taki and Natsume become depressed about how to catch the Stitch Mark Youkai without Natsume's sight.

Back at the house, Natsume finds out Taki talked to another person, Madara. As they walk out to meet Taki, Nyanko-sensei appears with a sealing mirror. The maneki-neko explains that if you hold the mirror to a youkai's eyes and chant a spell, the youkai would be sealed in the mirror.

Nyanko-sensei notes that Natsume smells delicious so he would be a good bait for the Stitch Mark Youkai. He comments that bored Akayashi would be quite interested in the Book Of Friends. All of a sudden, Natsume is knocked down to the ground by an invisible force, the Stitch Mark Youkai. Taki runs to one of her magic circles to try and catch the youkai while Natsume tries to reach the sealing mirror but is tied to the ground with a rope.

Taki manages to lead the youkai to the circle and stabs a stake through his clothing saying she caught him and to uphold his promise. The Stitch Mark Youkai refuses and starts crushing Taki in his hands. Madara appears but is invisible and helps Natsume reach the sealing mirror. Madara bites the Stitch Mark Youkai, causing it to let go of Taki while Natsume casts the sealing spell. Natsume and Taki both collapse after the ordeal.

When they've both rested, Natsume is able to see youkai and they go to school. Taki wants to find a way to thank Natsume but Natsume says that what she said about how the Book Of Friends must be a real treasure fo him is enough. Meanwhile, Chobihige and Madara bicker. Natsume's classmates, Kitamoto and Nishimura appear and the group head off to school.

Characters in Order of Appearance

• Takashi Natsume
• Madara
• Tooru Taki
• Chobihige
• Stitch Mark Youkai
• Satoru Nishimura
• Atsushi Kitamoto
• Jun Sasada
• Touko Fujiwara