Professional baseball player Kenji "Ken" Sato returns home to Japan, despite being on the verge of winning a championship in America. Reporter Ami Wakita attributes his sudden departure to rumors of unfinished family business, but in reality it is because his father, Professor Sato, is the giant superhero Ultraman, and because Ken inherited his father’s powers, he reluctantly had to accept Ultraman’s mantle of facing kaiju to keep them in check. After a battle with the monster Neronga, Ken feels underappreciated after complaints from citizens, and vents he never wanted to be Ultraman while reminiscing about his mother Emiko, who has recently gone missing.