Takeshi Yamato, a twenty-two year old young man lives a double life. During the day time, he is a rookie but popular science teacher at a junior high school in Tokyo. But after school and on Sundays he works as a member of the elite UGM(Utility Government Members), an earth defense organization which tackles difficult situations such as alien invasion and attacks from monsters. When the situation gets out of control, Takeshi transforms into a 50 meter tall mighty warrior, Ultraman 80 and knocks down the most terrifying monster to save the day.