^ Indeed, they usually quit fast if they don't have amazing numbers, but I guess Kuu kept a good momentum starting with Cutie Honey. Had she peaked earlier she probably would be even higher on the list cause sales were already so low by mid 2000s.
Thanks for those info, Corvina! It's so great to see her among all those legends (and it was a surprise for me ZARD was that high, I didn't know she was THAT legendary).
I'm a bit sad DH9 is still not on Spotify
At least not in Brazil