Curse Returns: What did the human-shaped wishing machine do wrong this time?

[The triplets Sukuna, Itadori, and Alluka - no romance, story-driven]
[The cover character is Alluka from the manga Hunter x Hunter]
This is not a wish-fulfillment story! This is not a wish-fulfillment story! This is not a wish-fulfillment story! It does not have a happy ending! It is not a redemption story!
Heian-kyo a thousand years ago,
He and his brother were both "unlucky children" who were not expected to be born. He can grant people's wishes, but on the condition that you pay the price for the previous person's wish.
The present world a thousand years later.
Lusuo wanted to create a vessel for "Ryomen Sukuna" for his great cause, but after the child was born, he saw that he had given birth to the wish-granting machine.
Could this child help him fulfill his thousand-year-old wish this time?
The main reason for the character being Alluka's younger brother is not because it's difficult to grant special privileges to native inhabitants.
This is not a wish-fulfillment story!! This is not a wish-fulfillment story!! This is a plot-driven story. Alluka's ability, like the Hunter's, is a rule-based weapon.
A flashback! The first four chapters are the prologue!
Chapters 5-38 are the Sukuna arc (Fujiwara Kita's background is based on the Heian period storyline involving Fujiwara no Michinaga and Fujiwara no Michitsaka), while the others are later in the manga.
Chapters 39-89, the Yu-Jin arc, can be skipped if you don't want to read about ancient times; it shouldn't have much of an impact.
Chapters 90-143: The main storyline ends at chapter 253 of the manga.
That's just how Alluka is! She has two souls in one body, loves to act cute with her brother, and has some gender dysphoria. If you can't accept that, please don't click in, thank you!