The Future is as I Say: The Vengeful Fortune Teller

In a back alley stands a fortune-telling shop called Hachikake, rumored to be "accurate". Even today, a line of customers burdened with worries forms outside its door.
The fortune teller, Mito Tawara, listens to her clients' stories, sometimes quietly, sometimes cheerfully, and then, at a certain moment, she whispers:
"Don't you want to curse that person?"
Shaken by words that test their resolve to cross the line, the customers entrust her with their "curses".
When Mito takes action, someone's wish is granted, and a price is paid.
Is that curse truly a "salvation"?