"I want to protect you, with everything I got."

"In the secluded land of the Immortal Shogun, the Bakufu rules Eternal. But what do mortals see of the eternity chased after by their god?" What do we see the eternity the Raiden Shogun is chasing for? What is the reason why she began chasing it? So many questions and I wanted to see for myself why is she so fixated with eternity. Also, that incident, is it also related to that? I have no choice but to find out.