During the early events of Kamen Rider Zero-One, Amatsu Gai initiates his plans, manipulating Hiden Intelligence, A.I.M.S. and even metsuboujinrai.net through the use of Yaiba Yua and the HumaGear Naki.

Amatsu Gai's machinations to complete the Thousand Driver face a challenge from within ZAIA in the form of an idealistic executive.