In their last year of high school, two girls in the brass band club perform a song inspired by a fairy tale that parallels their friendship.

A-ko and B-ko are fighting as usual, as C-ko watches from the sidelines feeling neglected by both. Ayumi-sensei has been behaving strangely lately. She's wearing a heart-shaped crystal with a hexagram inside, and is chanting mysterious prayers in private. At the ruins of an ancient civilization, an archaeologist spies a hexagram among the hieroglyphics. Deep in outer space, an alien fleet is on a course for Earth, and its flagship bears the same hexagram shape.

A-ko and B-ko's pursuit of a handsome Coke-loving, motorcycle-ruding stud named Kay has a wrench thrown in when C-ko grows very jealous of him. Meanwhile, the aliens' ship floating in the bay is about to turn into the ultimate nightspot. Good luck with that, catastrophe always occurs when the three 'Ko's get together.

スタッフ——
監督：もりやまゆうじ
原作：西島克彦、白根一美
キャラクターデザイン・作画監督：もりやまゆうじ
エンディング「心もJUMPして!～夏のイントロ」
歌：福永恵規
作詞・作曲：竹内まりや
編曲：戸塚　修
イメージソング「星のロマンス」
歌：福永恵規
作詞：許　瑛子
作曲・編曲：後藤次利
イメージソング「うわさのSuper Girl」
歌：伊藤美紀、篠原恵美、富沢美智恵
作詞：竹内まりや
作曲：和泉常寛
編曲：戸塚　修
キャスト——
伊藤美紀（魔神英子／Ａ子）
篠原恵美（大徳寺美子／Ｂ子）
富沢美智恵（寿詩子／Ｃ子）
玄田哲章（Ｄ）
林原めぐみ（うめ）