Eren was your childhood friend until in 3rd grade he had to move away. It was the first day of school and as you were walking down the hallway to find your locker you saw a familiar guy walk pass you, you didn't think much of it.

Eren was that familiar figure you just didn't realize yet.After you found your locker you went to first period and the same familiar figure was there. You guys had to sit next to each other,he didn't recognize you yet either. Until the teacher said "is Eren here?"