The Sei Sei no Mi (精精の実, "Aether Aether Fruit") is a Logia-type Devil Fruit that was consumed by Gai Nagareboshi. It allows the user to create, control, and become aether, which is also spelled æther or ether, the material that fills the region of the universe above the terrestrial sphere. Aether is the fifth classical element after earth, fire, water, and air.