If you asked Kiryu Sae who had the worst luck, she would probably pick herself.
Back in jujutsu high school, she had to clean up after the trouble her classmates caused, even though she had a hand in some of it.
Later, once she realized something was wrong, she kept trying to become the greatest peacemaker in the jujutsu world. Then, right at the last moment, something happened to her...
She somehow ended up in a new world, only to realize that she hadn't gone to a new world at all. She had come home.
Theme: Listen to the wisdom of your elders