The Second Chance Contract (Himeno X F.OC)

Himeno was dying.

Her body is consumed piece by piece in a desperate attempt to save Aki and the others.
First an arm, then the next, followed by her legs.

But as she lays there, agonizing over her soon-to-come death and the inability to save those she cares for, in that last moment before the ghost devil would be struck and end her life, something changes.

A voice whispered from the void in her mind.

"Make a contract with me, and I'll save you."