From: RevolverSaro | #014
A character from it, Yoki, becomes an important side character in Brotherhood. And his assistant, Lyra, becomes the main villain in the original
I'm aware, but neither of these two particularly need this episode for character development or anything. The only real purpose it serves is "oh hey I remember her." FMA: B gives this episode like 10 seconds so it's pretty clear they didn't think Yoki (who is more major than Lyra in the episode) didn't even need it.
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No problem!
This is a cute and pop genocide of love!