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Under his watch, countless other superheros appeared and followed in his footsteps. Discussion hero? However, after 5 years of war, Zero disappeared without a trace. Tags: I Quit A Long Time Ago Manga: Zero was mankind’s first real superhero. Discussion in ' Anime Discussion ' started by dio444 , Jul 18, 2019 . i quit a long time ago Anime PV is OUT and it's awesome !!!!