Prologue: Something is rising

(Godzilla x Kaiju Girls crossover)

He was a monster. Even among monsters, he was the most dangerous creature on the planet. After sixty-eight years, he's finally gone. In battle, the King of Monsters is hit with a devastating new weapon. While the Nations of the world celebrate, what they don't know that they've sent the Atomic Kaiju to parallel dimension. Well, sort of.

"Something is rising."
"What is it?"
"Not what. Who. And they are someone. . . powerful."

Inspired by AQuickSeriesofWords' fanfic.