First Lieutenant Shunichi Maki of the Japan Air Self-Defense Force is a prestigious F-15 Eagle jet pilot. A lifelong fan of flying since he was a child, being a pilot is his ultimate dream. Unfortunately, his duties distance himself from his wife, Yoko, who feels neglected, and his son, Tsugumu, who has a possibly terminal congenital blood disease.
Maki decides to quit the Air Force to devote more time to his family and to spend whatever time is left with his son. He takes a part-time job as a commercial tour guide for a kindly group of people who allow him time to take care of his family.
Prior to quitting, Maki and his flight partner Yamashima are alerted to a strange red light streaking towards Japan, and Maki’s plane passes through the red light seemingly without any damage. He suffers no ill effects other than strange images briefly playing out in his mind. He later discovers that the images are telepathic messages from a strange being that exists in the red light.
这时THE ONE开始现身袭击，但面对进化的怪兽却无反击之力。这时，逃出监视的真木现身了。虽然在THE ONE的攻击下撞上墙壁，但他却并未丧命，且变身为超人“ULTRAMAN THE NEXT”，两者展开了对决。但因为NEXT的变身型态并不完全无法发挥全力，结果消耗了大量体力并让THE ONE逃逸。
而后真木发现儿子继梦病倒，说服了BCST前往医院探视儿子的病情。真木与继梦父子间订下了一个约定。而THE ONE这时却也在附于老鼠身上之后巨大化，就在人类面临危机时，成为完全体的ULTRAMAN THE NEXT出现了，以新宿为舞台，与THE ONE展开殊死战。