Once Eren got there, there was nothing to be seen, as if she actually disappeared. However, she leapt down from whatever high ground she was using to watch this person follow her, landing right behind him as she held him tight as well as holding her hidden blade close to his neck.

"Why are you following me? Are you with them? The Templars?" Kaika whispered in a serious voice, knowing she was being followed this entire time.
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"You could say that..." Takahisa said, getting a brief flashback to how Peyton would always call him that.