While they were walking towards the direction of the school, Kaika mentioned,"So...I had some weird dream last night, not that all of my dreams are normal anymore...but I think I saw you in it, well...you looked pretty young, and the entire place was being ravaged by Titans..." Apparently Kaika's dream was an exact memory of Eren's, where Wall Maria fell to the Titans.
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"Don't mention it, you would always do the same for me," Takahisa said, since Armin would accompany him when he was injured or just having a nightmare.