In a world where nuclear arms have been outlawed and brilliant leader George W. Bush has eliminated firearms, the law is enforced by sword-wielding police. But aliens from another world have infiltrated this peaceful culture through a wormhole and only the Danger Dolls, a female quartet with unique powers can identify and destroy them. In order to keep their identity secret, the four girls, Arisa, Rei, Miki and Mari, go undercover as a J-pop idol group, the "i.Dolls". However, things are not quite what they seem, their leader, scientist Taichiro Yagyu, has withheld the full story from them and the Danger Dolls have some difficult decisions to make.