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Yoshiki yells back that he cannot let her go back to Heavenly Host, and points out the many assumptions she had made and that she did not have any plan which would only lead to her death.

However, upon inspection it begins to write itself causing concern and explains a bit about Naho's darkening, then both Yoshiki and Ayumi leave the classroom to explore the third floor.

If Ayumi herself doesn't believe in these, then nobody else will.

In Corpse Party, she is possessed in chapters 2 and 4.