Sion is a healer with only months left to live.

Rather than spend his remaining time watching three women he cares about suffer from fatal curses, he secretly takes their curses into himself using the forbidden Stigma of Vicarious Atonement.

The Sword Saint Elena. The Saintess Seraphina. The First Princess Veronica.

With their curses gone and his own death drawing closer, Sion quietly leaves the capital for a remote valley. He plans to spend his final days in peace and disappear without making anyone mourn him.

It doesn't quite work out that way.

The three heroines discover what he sacrificed for them, and refuse to let their healer quietly die alone.