This is a 17 yo classic, while both animation character design and music show their age, they are still impeccable and very good if you look at it from a classics's perspective... The best about The Metal Idol, is the Intricate story that develops really slowly but very deeply and very detailed, episode 14 at 97m was almost mind washing, almost everything is explained, all the secrets and mysteries built and there is a lot of character development, this all continues in the last episode where they continue to build up and prepare for the last assault, there are many sacrifices in the path for Keyto become Human once again but in the end everyone is saved with her Lulaby...
The cast for this anime considering its age its very well composed, specially the male V.A. i could reckon them all in recent anime with a single exception of one actor that isnt very well known...

This is a great classic, maybe a little sad but a very mature look and story...