IDOLs are robots used to destroy "Drop"s, remnants of the destruction of the Moon 107 years previous during an event called the "Lost Artemis". Humans found a special silicon on Earth, probably from fallen Drops, and started research to turn that silicon into IDOL cores. There are a total of five cores. Normally, Drops are dealt with using missiles; however, since Japan does not have a missile system because they cannot build a nuclear warhead under the
Three Non-Nuclear Principles, they were assigned and approved to use IDOLs in order to destroy Drops. IDOL pilots have to be girls, and they have to be chosen by the IDOL itself; those people are called Idolmasters. The IDOLs are named after
lunar features. The Shuko, mentioned only in passing by a side character, was to become the main focus of the show, however a budget cut meant that a core element to the overarching story arc was left out.
Mondenkind ; Prometheus–1 Imber • Master: Chihaya Kisaragi, Haruka Amami • Colors: white and indigo blue (episodes 1–7), white and pink (episode 8 on) • Name origin:
Mare Imbrium ; Prometheus–2 Nebula • Master: Azusa Miura (past) Makoto Kikuchi (episodes 1–13), Iori Minase (episode 14 on) • Colors: yellow and orange • Name origin: Palus Nebularum ; Prometheus–4 Tempestas • Master: Mami and Ami Futami • Color: red • Name origin:
Oceanus Procellarum Turiavita ; Prometheus–3 Nubilum • Master: Chihaya Kisaragi, Yukiho Hagiwara • Colors: black and red • Name origin:
Mare Nubium ; Prometheus–5 Hiems • Master: Makoto Kikuchi • Colors: white and yellow • Name origin:
Lacus Hiemalis ; Epimetheus–1 "Epi-chan" • Master: RIFFA • Color: blue • Name origin:
Epimetheus ==Terminology==