In Zero One series, Zaia Enterprise branches is all over the world 1000% including Zaia Japan, led by the CEO Gai Amatsu. Zaia Enterprise is a multinational technology conglomerate with offices based around the world.
They were founded at some point and opened a branch in Japan, with Gai Amatsu serving as its CEO. The Japanese office is the main benefactor for A.I.M.S. and is responsible alongside Hiden Intelligence for the creation of Daybreak Town. It was shown that Zaia Enterprise already has various branches throughout the world.