Allen transmigrated to prehistoric Tiga. He would have been content to live out his days in comfort and die of old age, but then he received the light of Tiga himself.
The Dark Ruler, the Four Dark Giants, the Flower of Qijiela, the Giant Civil War, the Kirielians, the Zena Kintalans, Isiris...
Countless powerful foes lurk in the darkness that rules this world. Should he lie flat and accept the end, or become a light and fight back against this endless darkness?
"Why? Why did the light choose you?"
Allen: "The light didn't choose me. I chose the light!"
PS: Since the writers of Tiga's TV series kept contradicting one another, the show, the movies, and the official novels all conflict. So I've filled in some gaps with my own interpretations to make the story logically consistent!