Sites:
| Break Free: Episode listing, voice actors, song lyrics, and commentary. | | In the Night: Character profiles, relationships, trading card information, cels, and links. | | Key the Metal Idol: Includes series history, characters, seiyuu information, merchandise listing, screen capture and cel galleries, and a mailing list. | | Key's Lullabye: Story summary, character listing, screen captures, seiyuu credits, and wallpapers. | | Olen's Anime Hub: Key the Metal Idol: Storyline and thumbnailed image gallery. | | Ryeka: Screenshots: Key the Metal Idol: Images from the first two episodes. |
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Classical
