Everyone’s starter anime is death note.
I don’t count sailor moon or dbz cuz you watched those as a kid and assumed they were cartoons.
I mean when you got “into” anime fully aware of what it was and actually became immmmmmersed in this bizarre weeb culture.
It’s usually death note.
Mine was higurashi actually, I’ve never finished death note
Mine was shaman king
Mine was Fullmetal Alchemist (2003)