The universe is being swallowed by an unprecedented shadow. The ancient darkness - Dark Lukiel - has returned in a stronger form, its power is enough to annihilate the stars and plunge thousands of galaxies into eternal night. The Kingdom of Light tried its best to resist, but like fireflies shaking the mountains, it was on the verge of falling. The last hope lies in an ancient prophecy: when the darkest moment comes, the "Light of the Galaxy" will awaken on the earth and find its successor.
At the same time, in a quiet town on Earth called Jiangxing Town, Lidang Guang, a 17-year-old ordinary high school student, was originally spending an unremarkable summer vacation. However, a strange dark event shrouded the world, closely connecting him with a mysterious prop from the universe-the "Galaxy Spark" and the Giant Doll of Light sleeping inside. Driven by fate, he shouted out the vow that changed his life:
"Super Fusion-Ultraman Galaxy!"
Since then, the daily life of auditorium light has been completely subverted. He is not only the light in the high school auditorium, but also the human body of Ultraman Galaxy, the giant of light from the future. Accompanied by Ultraman Taro, a warrior from the Kingdom of Light (guided by ideology), Xiaoguang must begin to learn how to control this sudden great power.
