Usagi no Princess - Vol. 1 Ch. 10 - Extra 2

[MangaDex]

 

[Mangamoz]

Must have been reading them Twilight, how evil.

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[Angry_Panda]

Thanks for the chapter!

 

[HamboneJalopy]

Hoist with her own petard.

 

[Omb74]

She probably read them Scary Stories to Tell in the Dark.
Anyone of those stories would've scared them, but my money is on "Footsteps".