" My name is Twoearle. Do you like Twin Tails ? Then take this red bracelet . . . . "
- Twoearle (トゥアール Tuāru?)
- Voiced by: Maaya Uchida (Japanese);
- Morgan Garrett (English)
Twoearle is a mysterious girl who comes from another planet, probably in another dimension. Soji quickly becomes the object of her interest, especially when it becomes apparent that her TailGear needs to be reassigned to another Twin Tail Warrior girl. She enjoys teasing Aika with her large bust and often ends up grievously injured for it. She fell in love with Sōji at first sight and openly tries to seduce him, with his mother's approval. After Sōji defeats the first wave of attacks from the monsters, she receives permission from Soji's mother to build a command center under their house. Later, she decides to transfer into Yōgetsu Private Academy as a student and calls herself Sōji's relative. Twoearle's age is never stated or reveled, but she appears to be in her late teens or early twentys, at least according to Earth time.
Before arriving on Earth, she was the original Tail Blue, but gave up her twin-tail hair style as a sign of defeat against the Elemelians. She then used her TailGear to make TailRed's TailGear after she lost the ability to defend her people, and her world lost all its 'attributes' to the Elemelians. Being on Earth, and now working with humans, gives her another chance to stop and defeat the monsters who so thoroughly wrecked her world.