Wow. You are really missing a lot starting in 1997. Just to begin with Onyanko Club from 1985 was the progenitor of much of common idol group culture. They invented things such as unit groups, graduations etc. And there were even groups prior to them.
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Why not start with the 70s idol girl groups like Candies and Pink Lady?
[Candies vs Pink Lady](https://m.youtube.com/watch?v=YVeXnx5b0Is)
Wow. You are really missing a lot starting in 1997. Just to begin with Onyanko Club from 1985 was the progenitor of much of common idol group culture. They invented things such as unit groups, graduations etc. And there were even groups prior to them.