The second captain of the Maritime Self-Defense Force, who is investigating the UFO falling in the Pacific Ocean, is in the process of investigating the UFO, and is affected by the luminescent body, which leads to the deterioration of the genetic factor standards and turns into a vicious monster THE ONE.Afterwards, he (THE ONE) escaped from the surveillance of the special agency BCST (a research agency for bioengineering), a special agency in the Defense Department, and he lost his voice training since then.On the other hand, F15J pilot Shunichi Maki (Bai So Takaya), a son of the Aviation Self-Defense Force, decided to resign from his official position in order to spend more time with his son Jimeng, who has a congenital disease.During the last flight, Maki met the "red glowing body" in the air.This is what happened 3 months after the one incident.But Maki miraculously survived, and then changed his job to become a civil aviation pilot and embarked on a new life.There are still great concerns about such maki, especially Sara Suwon, the chemistry officer in BCST. BCST forced the maki away and monitored the body in the BCST laboratory built in the waste factory.At this time, the unknown monster THE ONE came back as if attracted by something.Maki, who was dying by THE ONE attack, changed his body and transformed under the power of the red light ball!He became a steel body with a height of 10M with silver light, and occasionally Maki, who had his own will, and fought against THE ONE. However, because of his incomplete transformation, his energy was consumed quickly, and he changed back to the shape of Shunichi Maki after receiving a decisive blow.Then Saro named the living body that appeared after THE ONE "THE NEXT".Maki learned about his son Jimeng being admitted to the hospital on his way back to the BCST laboratory from Tokyo. After rushing to the hospital, he met his wife Rongzi again.At this time, the biggest crisis of mankind has emerged. THE ONE, which has absorbed various creatures into the body and produced mutations, returned to the streets in Shinjuku. The super-fire light bomb emitted from the mouth burned the streets to pieces. The personality of grief has been replaced by THE ONE and has become a state that cannot be transformed back into a human being.However, such a couple who had a marriage contract with Suwon Sara in the past. For the memories in Sara's heart, and for the agreement with his son Jimeng, and to protect his beloved family, Maki transformed again.That posture evolved even more to a huge 40m, with a bloody red in the indirection, and the two elbows featured an elbow knife.Now, with Shinjuku Sub-town as the stage, the fire of the decisive battle between ULTRAMAN and THE ONE has begun to burn!