In fact, belonged to the earth garrison, and member Saori Maejima of the national Idol "seventeen" kept peace of the earth as huge hiroinshirufina. Sain of the urgent dispatch is in the Saori which enjoyed off on such one day. Spider type monster taranteisu appeared suddenly, and have begun to destroy a town. Besides, taranteisu faced the town of Akihabara that was a sacred place of the seventeen! The Saori fights against taranteisu while transforming itself into shirufina, and protecting the Akiha dome which is a concert meeting place of the seventeen, but taranteisu tightens shirufina with eight feet.
