The story revolves around a young college student named Sun Taiyo, who was born in Japan and raised in Los Angeles. The alien organization known as the Dark Matter Empire has captured Sun’s father, an environmental scientist developing technology to harvest and utilize natural energy, and is now targeting Sun. With the help of his mentor Tsurugi Sensei, he is able to transform into Fujiyama Ichiban using the solar-powered suit of armor developed by his college instructor, Professor Sebastian. Sun fights side by side with his girlfriend Sakura Sugiyama, who can transform into Sakura Ichiban. In times of need, new weapons and gadgets are delivered to our heroes with the help of the bird-robot Emerald.