Story:
 
Sōji Mitsuka is an ordinary high school boy who has an obsession for twintail hair. One day, he encounters a mysterious girl named Thouars from a parallel world when monsters appear in his town who declare that all twintails in the world belong to them. These monsters feed off the "attribute power", the spiritual energy of humans. Thouars entrusted Sōji with Tail Gear, imaginary armor initiated by powerful twintail attributes. With the armor, Sōji transforms into Tail Red, a twintail warrior, to protect Earth.