Part of MAGES' multimedia "Idol Jihen" project. The anime takes place in a parallel-world Japan, where idols stand up against a corrupt government as "idol Diet members," and then work to bring back the smiles of the Japanese people through song and dance. The idol Diet members belong to seven different political parties, including the Heroine Party, the SOS Party, the Subculture New Party, the Bishojo Party, the Wakaba Party, the Starlight Party, and the Sanrai Party.—Anime News Network

Increasing income divide, creeping environmental pollution, unsolvable waste issues, childcare waiting lists being discussed without those concerned, repeated corruption... The government, smeared by vested interests, can't do a thing against the many problems and sources of discontent. It's in this situation, with Japan cornered with no way out, that idols rise up to save the day. The Heroine Party, Sunlight Party, Starlight Party, Bishoujo Party, Wakaba Party, Subculture New Party, and SOS Party. From these seven idol political parties, the idols who have become National Diet members and representatives for each prefecture will smash through the sense of stagnation covering Japan using the power of song and dance. They'll bring back the smiling faces of the people, and wrap Japan in a glittering aura!!.—Honeyfeed

The story is set in a parallel Japan very similar to the modern Japan we known today. Japan's government can do nothing about the abundant problems and discontent throughout the land. Now, at long last, idols are taking a stand to rescue a nation with no way out. The Heroine Party, the Sunlight Party, the Starlight Party, the Bishoujo Party, the Wakaba Party, the Subculture New Party, and the SOS Party: idols from these seven idol political parties who have become Diet members representing each prefecture will crash through the sense of stagnation that surrounds Japan!.—Crunchyroll

In a parallel Japan quite similar to the modern Japan we know of today, it has plunged into a dark era of political conflict. Increasing income divide, creeping environmental pollution, unsolvable garbage problems, childcare waiting lists being disputed while those directly involved aren't present, repeated cases of corruption... Japan's government, entrenched in its own vested interests, can do nothing about the abundant problems and discontent throughout the land. Now, at long last, idols are taking a stand to rescue a nation with no way out. Seven idol political parties who have become Diet members representing each prefecture will crash through the sense of stagnation that surrounds Japan with their song and dance. They will bring back the people's smiles and envelop Japan in their shining aura!.—Idol Jihen Wiki

In a parallel world similar to ours, the nation of Japan is plagued with social problems, yet its government can do little or nothing. To save the nation from collapsing, seven idol parties become Diet members and, by their song and dance, will rescue the Japanese society from stagnation.—Anime News Network