The tale of Souji Mitsuka, a typical high school student with a particular penchant for twintails, unfolds in a world where parallel dimensions exist. When monstrous creatures descend upon his hometown and assert their dominion over all twintailed individuals, a chance encounter with an enigmatic girl named Twoearle changes his life forever. Twoearle bequeaths to Souji the Tail Gear, a mystical armor that harnesses the potent energies of twintailed beings. Empowered by this remarkable tool, Souji realizes his destiny as the formidable Tail Red, a warrior donning the guise of a girl, sworn to defend the planet from harm.
