The life that was born from the wills of both the planet and a human (Saki and Aoto). Yea's a girl, by the way. In Saki's Level 8th Cosmosphere, she will give up her Divinity so she can stay on Aoto's side. Saki and Aoto made Yea using their true feelings and symponic power. Yea is also the subsitude for Saki.