Gonna be the Twin-Tail!!

Souji Mitsuka, a first-year high school student, has a unique hobby: rating girls' twintails. He takes his interest so seriously that he even starts a club dedicated to the hairstyle. However, his life takes a drastic turn when aliens from outer space begin attacking Earth and targeting its twintails. Twoearle, a mysterious woman, recruits Souji to fight back as Tail Red, a warrior with the ability to wield powerful twintails.