Three years after Gatanje was sealed, the earth seemed to have returned to peace, and the members of the Victory Team gradually returned to their daily lives. However, the sudden appearance of a mysterious monster in Tokyo Bay gave rise to the unexpected rebirth of the long-dormant giant of light, Ultraman Tiga. This time, accompanying him on his return was an ancient slate fragment from the Luluye ruins. It exuded a faint but firm light, as if it was guiding something.
As monsters and unknown aliens appeared one after another, Dagu and the members of the Victory Team discovered that behind these threats, there seemed to be a conspiracy that spanned a thousand years. The slate fragments resonated with the golden metal fragments that appeared in the battle, gradually revealing the secret of the "star core fragments" - they are not only amplifiers of Tiga's power, but also the key to awakening a sleeping existence.
From the permafrost of Siberia to the boundless sand sea of North Africa, from the dark abyss of the Mariana Trench to the forgotten ancient ruins, Dagu, with the light of Tiga, embarked on a journey to collect fragments with his partners. The discovery of each fragment is accompanied by more powerful enemies and more shocking truths: These threats are actually closely related to the "Mother of Darkness", a collection of darkness at the beginning of the universe, and Gatanje is just her pioneer.
When the five star core fragments are gathered together, the door to the "Cradle" opens, where sleeps the last hope against the Mother of Darkness, and also buries a "taboo" that can destroy the world. Will it awaken the guardian, or fall into eternal darkness? Dagu stood at the crossroads of destiny, holding the light in his hand tightly. This trial across time and space will determine the inheritance of the earth and all light
