Eifuku is an Invading Horseshoe Crab Raider in A.I.M.S. and a supporting antagonist in episode 33 of Kamen Rider Zero-One.
He is portrayed by stuntman Eitoku.
Deeming Yua to be a failure, Gai sent out A.I.M.S. Battle Raiders Eifuku and Ito to deal with her, but Vulcan fought them off. Later, when Yua failed to apprehend a HumaGear that had been reactivated, the tennis HumaGear Love-chan, Gai showed up accompanied by Eifuku and Ito and told Yua to step aside, confronting Aruto Hiden and Isamu Fuwa. After Gai revealed that Fuwa's memories of his junior high school being attacked by HumaGears were fake memories that he had inserted and caused him to have a breakdown, Aruto and Yua suited up to fight Gai's forces. While Gai became Kamen Rider Thouser and fought Valkyrie, Eifuku and Ito became Invading Horseshoe Crab Raiders to deal with Zero-One. As Vulcan joined the fight and helped Valkyrie defeat Thouser, Zero-One defeated both Raiders.