From a worldline where humans and witches formed an alliance, Rin, who calls herself the "Great Witch of the Middle," arrives in this world after the Great Witch has left, carrying magic that lets her leap between worlds. She kicks away the murderer who killed Coco's family, sends the higher-ups at Sherry's orphanage to prison, beats Marg's abusive stepfather so badly he will never dare raise a fist again, prevents An'an's parents from degenerating into puppets, and makes sure the fire started by Arisa is put out before it can spread...
"To make sure your own world can keep running normally, I'll work alongside you on this timeline. The most important task is to make sure that in that timeline, you start winning every day, every month, and keep winning forever." That's what Rin tells the "former prisoners" of Witch Island.
This is a story set after the Final Trial has ended, and also a story set before the First Trial begins.
"You know, actually, in the setting of our world, the 'Great' in 'Great Witch' isn't a title..."
"Really? Why are you telling me this..."
"Nothing. I just wanted you to know..."
[A postscript to a Witch Trial fanfic.
