Dezatopia

Momoko, a fashion-obsessed high school girl, stumbled into the underground civilization that humans never knew existed — and decided the logical response was to merge the two worlds into one. Her plan: Dezatopia, a new society built on a towering bridge between surface and subterranean. Two of her classmates, Akane and Aoba, are hired to help build it — and then learn the full scope of what Momoko intends. They sabotage the project. Their only weapon against the army of underground creatures loyal to their human queen is their work ship, the Speleological Fighter Pink Aurora.