Mecha-Ude: Mechanical Arms

Season 1, Episode 7: You Just Met Me...

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After a fierce battle with Amaryllis, Alma regains his memories. His expression seemed grim, so Hikaru asks him what's wrong, but then Alma runs away. In order to get clues of where Alma may have gone, Hikaru goes to ARMS HQ to see Alma's older brother, Fist. Fist then explains the past of all of the Mecha-Udes including Alma.