About Mark-Ironer Youkai
A powerful youkai which was sealed in Oosugi. He left a curse mark on Natsume that would kill him in five days. Hinoe helped Natsume to summon shiki that would protect him against this youkai.
[Spoiler] It was Misuzu who had lured Natsume to this youkai. He was testing if Natsume is worthy person to hold his name in the Book of Friends. [/Spoiler]
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