Gonna Be the Twin-Tail!!

Soji Mitsuka and his childhood friend Aika Tsube are approached by a mysterious woman named Twoearle who hopes to recruit them to fight against an evil force.

Twoearle explains more about the Tail Gear to Soji and Aika and proposes building a secret base below Soji's house.

With the secret base complete, Twoearle gives everyone a tour, and Soji must head into battle when an Emelian appears.

Twoearle decorates the club's classroom ahead of the Twin-Tail Club's beginning. Meanwhile, as Ultimaguil is on the ropes, reinforcements arrive.

Erina tells Soji that she doesn't feel qualified to be one of the Twin Tails after he first outing as Tailyellow does not quite go to plan.

A powerful Elemelian officer, Spider Guildy, appears to challenge the Twin Tails. Later, Aika finds a girl in Soji's bed who claims to be Soji.