Ore, Twintail ni Narimasu.

Souji Mitsuka loves twin-tail hairstyles more passionately than almost anything else in his life. That makes the arrival of the alien Ultimegil unusually personal: the invaders drain people of their "attribute power" and have taken a particular interest in girls who wear twin-tails.

A mysterious girl named Twoear gives Souji the ability to transform into Tail Red, a small red-haired female warrior whose power is fueled by the very obsession he has always cherished. Joined by Aika and Erina, Souji turns his eccentric passion into a genuine weapon against the invaders. Saving the world is important, but for him, protecting twin-tails from extinction may be an even more urgent cause.