Jujutsu Kaisen: I'm Everyone's Big Sister

(Everyone is strictly platonic; a little crossover with Natsume’s Book of Friends; the story only goes as far as the Hidden Inventory Arc; the heroine is the strongest; regrets are remedied.)

Chu Yi was a rather unconventional exorcist, and she had a sword that devoured every kind of energy.

After accidentally transmigrating, she chose to hunt cursed spirits, unusual entities, to gather enough energy to return home.

Along the way, thanks to her far-superior physical abilities and strength, she became the physical training instructor for the three students at Jujutsu High. She met a boy who could see yokai, saved two ghosts, took one ghost’s son in as her adopted son, and used her connections to change the Jujutsu Society.

She formed deep bonds with everyone and unintentionally changed their futures.

Chu Yi: “You don’t call me Big Sis for nothing.”

/

On the streets of Shinjuku, the two went their separate ways.

Shoko Ieiri watched her two idiot classmates argue over an ice cream, then walk a little way apart before turning around and awkwardly making up.

As the two came toward her after reconciling, she sighed helplessly. They were teachers now, so why were they still so childish?

Suddenly, the air beside her rippled and split open, and Chu Yi stepped out. No one around them noticed a thing.

“What’s going on?”

“Gojo stole Geto’s popsicle and taunted him, so Geto got mad and they stopped speaking for a bit. They just made up.”

Chu Yi smiled. “They’re best friends, after all. Neither of them could stand ignoring the other for long.”

With all three of them together, Chu Yi opened a passage again. “Let’s go home for dinner. Fushiguro’s cooking today.”

The four of them walked off, their elongated shadows shining brilliantly.