Mother of Ultra, you wouldn't want Father of Ultra to find out about this, would you?
From the start, Ji Bochang, a Blue Star human, transmigrates into the Ultraman multiverse and gains sole possession of Tiga's power.
The myths of East and West invade from the start. He steamrolls Yamata no Orochi, suppresses Zeus and Odin, and uses overwhelming strength to subdue the world and establish the rules of his rule.
When the Land of Light offers him a position, Ji Bochang publicly calls out its hegemonic nature and declares that he will replace it.
He storms the M78 Nebula alone, takes Ultraman King's ultimate attack head-on, and pins the Plasma Spark Tower down with one hand. He activates his Sovereign Form, locking down the entire battlefield, defeats the Space Garrison outright, deposes Father of Ultra and Ultraman King, and rebuilds the Land of Light as the capital of Ji Kingdom.
Afterward, he rules over the four great factions, conquers three nebulae, sows discord among the Absolutians and brings them under his command, opens a passage to parallel universes, and expands into every Ultraman universe in the franchise.
At last, cosmic-rule-level gods and the Gathered Darkness descend one after another. Ji Bochang faces them in his Sovereign and Astral forms, embarking on the path to become the multiverse's sole ruler.