Planet Earth is on the brink of invasion after humanity ruined the peace and quiet of the universe with the broadcast of metal music on the Voyager probe's Golden Record. Aliens picked up the signal and couldn't stop headbanging, and now they're dying off because of it, so they want revenge! The only thing standing between these music-hating creeps and total planetary domination is...a metal band? Landing over the sleepy Tokyo suburb of Kichijoji, the invaders abduct an unassuming high school student and merge his soul with that of Rinko, the drummer in her high school's outrageous all-girl metal club. Now sharing Rinko's body, this unlikely duo will have to team up to take down the aliens with the only weapon they have: metal. Joining this pair are Rinko's bandmates in K.M.G. (Kichijoji Metal Girls): Kia, super sci-fi nerd and synthesizer player; Mani, resident rich girl and bassist; Shiimi, delinquent and lead guitarist; and Erii, gentle giant and backup guitarist. Together, they'll perfect their music to thwart the aliens and protect the earth, all while navigating the rigors of regular school life.