OVA
Description
Yoni serves as a shrine maiden and guardian within the Temple of Leda in the fantastical realm of Ashanti. She belongs to an ancient order dedicated to preserving the legacy of the legendary warrior Leda and protecting the dimensional boundary separating Ashanti from Earth, referred to as Noa. Following the decline of her order, she becomes one of the last guardians awaiting the prophesied arrival of Leda's successor.

Her appearance manifests in two distinct forms across official media. She appears either as a young girl in humanoid form, or as a small, winged creature resembling a green rabbit with soft fur and red pupils, identified within the narrative as a "baku"—a mythical dream-eating entity from Japanese folklore. This dual nature reflects her mystical role.

Yoni actively guides the protagonist, Yoko Asagiri, upon her arrival in Ashanti. She provides crucial exposition regarding the threat posed by the antagonist Zell, who rules the floating fortress Garuba and seeks to invade Earth using Yoko's music. Yoni leads Yoko to the Armor of Leda, a dormant giant robot hidden within the temple that transforms into the spacecraft Wings of Leda, revealing its activation mechanism requires the presence of Leda's warrior.

In combat against Zell's forces, Yoni pilots her own giant robot, Rubber Star. This machine is destroyed during an assault by Zell's aerial fortifications, compelling Yoni and Yoko to continue their mission aboard the Wings of Leda.

Yoni possesses specific abilities tied to her mythological nature. As a baku, she can enter dreams and nightmares to consume or manipulate them. She also demonstrates the capacity to transform into a sword wielded by Yoko during battles. Her knowledge encompasses the operation of Ashanti's technology, including the giant robots and aerial vehicles known as "steeds."

Zell captures Yoni and her companions during the confrontation at Garuba Castle. He employs a force field to separate them from Yoko and subjects Yoko to an illusionary dream. Following Yoko's breaking of the illusion and Zell's defeat, Yoni escapes the collapsing castle alongside the others before Yoko returns to her own world.