I, Hikigaya, the snake of the red world god's ritual!

The moment Hikigaya Hachiman stood on the throne of Seirei Palace, countless red demon kings looked at the newly born demon king with boundless fear in their hearts.
"Have you fallen, Hikigaya!"
Facing the questions from the red world gods, Hikigaya Hachiman said seriously:
"You are too arrogant, the calamity fire of heaven and earth, the snake of sacrifice."
"From the beginning, no one can stand in the sky, neither you nor me, nor the gods... However, this unbearable vacancy of the throne of heaven will come to an end!"
"From now on, all you demon kings of the Red World must bow their heads, and I, Hikigaya, will stand in the sky!"
.......
A car accident caused a red god named the Snake of the Ritual to possess Hikigaya Hachiman. From then on, something went wrong in the entire Chiba City.
Shana, the red-haired and red-eyed girl holding a tachi?A classmate who suddenly disappears?Yukinoshita Harano who is determined to become a Fire Mist Warrior?There is also a terrorist organization called the Masquerade that wants you to be its leader?
Since the world is so chaotic, why not correct it yourself!
I, Hikigaya, will stand in the sky!