Center of the Sunlit Sea || Chisaki Kai/Overhaul x Shirabe Mariya(OC)

Three years before Overhaul's reign of terror was cut at the neck, a frightened child with a small horn growing from her forehead appeared in the Shie Hassaikai compound. Five years before then, two young adults said their bittersweet goodbyes as one rose into the limelight and the other descended further into shadow. Ten years before then, a dirty child with a spark in his eyes was picked up off the street by the old yakuza boss.

"You don't have to look so sad, Kai-chan. I'll be back soon."
"How can I trust you? How do I know you won't fall asleep for good this time?"
"What if I cross my heart and make an unbreakable promise to come back?"
"...Okay, if you promise, Mari."

Chisaki Kai and Shirabe Mariya, old friends molded from the same clay who became two completely different works of art, reunite after years of silence to look after Eri when she is brought into the Shie Hassaikai's care. In the age of heroes, the yakuza are no longer the feared power they used to be, but perhaps that can change. A single carefully placed stone can divert the course of a river; who is to say fate itself cannot be changed just as easily?