I mean, technically in this case they do have childhood memories of each other and remember those memories very well, they just reasonably do not recognize each other as adults based on misinformation.
But I get what you mean lol it does happen a lot. I at least think it's nice that it's changed up to them remembering the childhood versions of each other, but circumstances making it hard to recognize each other. Whereas, some other ones it's they both don't remember or only one of them remembers.
there is a reason for that
light spoiler:
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the MLs ability devoured parts of their memories of each other. so they have both difficulties recognizing the other, because the parts they still remember don't really help. The other Epser who left together with the ML, who was there too, recognizes the MC the moment he sees him.^^"
Can I have a story where MC and ML doesn't have any "childhood memories" with each other that they seemed to not remember? Like it's overused and I want to see smthn new