For the sake of the Earth, I will become a twintail! Mitsuka Souji is a normal high school student with an extraordinary passion for twintails. One day, Twoearle, a beautiful, mysterious girl who claims to come from another world, appears before him. And at the same time, monsters appear in the town where Souji lives! “Fuhahahahaha! We will gather all the twintails of this world!” They are creatures from another world who feed on the power of the human spirit, Elemera. Twoearle entrusts Souji with the Daydream Armor “Tailgear,” which is powered by his intense twintail element, and he transforms into a young girl twintail warrior, TailRed!