I can't remember if it was on mangago or on myreadingmanga but it was about eren and Levi. They were reborn and I think eren was reborn as the father of Levi? In the beginning only Levi remembered their past life with the titans and stuff but eren didn't.
I think there was one scene where eren was sleeping on a couch and then levi went up to him. The eren said something while asleep about the past life.
Sorry for the shitty explanation
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Fuck... I cried ╥﹏╥