斗え！スペースアテンダントアオイ

In a future where space travel has become possible, Ketakea Airlines employs space attendants as security personnel specialized in close-quarters combat to counter hijackings using their own bodies as weapons. One of them, Musashino Aoi, is a self-proclaimed "clumsy, slow, and slightly cute turtle girl" who is utterly useless at everything except martial arts!? Just as she is finally assigned from a local line to an interstellar route, she encounters a mysterious young passenger named Raika, who mutters, "My songs bring misfortune to people..."