Others cultivate immortality, and when they reach the end of their cultivation, they ascend to the immortal world. But the protagonist is different. He practices Shinto and walks on a path that has long been cut off. For others, it's the end of the world when they reach the Immortal Emperor. For him, the Immortal Emperor? That's just the starting point.
That's right, as soon as the protagonist steps into the immortal world, he has immortal emperor-level combat power. The strongest being in the entire immortal world is just an equal in front of him. And he will continue to become stronger - lower god, middle god, upper god, heavenly god, all the way to the god king.
When he becomes the God King, he will do a great thing. More on that later.