High school freshman Souji Mitsuka champions twintails as humanity's ultimate beauty. His twintail admiration leads him to create a club dedicated to this hairstyle, but his world is turned upside down when extraterrestrial creatures invade Earth, targeting twintails. Twoearle, a mysterious woman, recruits Souji to harness the power of twintails as Tail Red, combating the alien force Ultimegil. This ruthless organization aims to conquer Earth and drain its spiritual energy. With allies Aika Tsube and Erina Shindou, Souji must protect twintails and thwart the alien threat.