After transmigrating into the fringe branch of an old, powerful family with no cursed energy, Kawabata Yoshiko took it easy without a care in the world. She was so lazy it was downright outrageous.
Unfortunately, the good times didn't last. The strongest dragged her back to reality, and she was forced to slave away, doing her part to build a harmonious, wonderful jujutsu world.
For the sake of her dream of retiring early, and... because Gojo Satoru had been her first anime crush in her previous life, she accepted her fate.
She diligently exorcised curses, painstakingly wrote reports, and worked with him to bring the corrupt jujutsu world crashing down from within and without.
In the final battle, she even bet everything on a one-for-one exchange, managing to pull the strongest out of the "cat box."
As her cursed energy ran out, she thought, It's finally over. Now I can quit and go lounge on a beach in Hawaii, right?
And then...
When she opened her eyes again, the first thing she saw was a boy's face, impossibly handsome and magnified to fill her vision. His icy blue eyes peered at her with curiosity through tiny round sunglasses.
...Could someone explain why, after escaping the "cat box," the world outside wasn't a beautiful future of financial freedom, but Gojo Satoru ten years younger?
Not love at first sight. Not a Mary Sue. An ensemble cast, with a bit of a love triangle involving Gojo at different ages, and some Inception AU elements. (You don't need to have seen Inception; it's only a tiny bit of the setting.)
No crossover with other anime. Jujutsu Kaisen only.
Theme: Hard work pays off