Yuta's Little Sister, but from the Dark Continent

[The whole story is complete. Thank you for supporting the official version!] ------Story Blurb------ A baby girl was born into the Okkotsu family. Black hair and crimson eyes. They named her Okkotsu Ai. Yuta, who was a year older than Ai, couldn't help loving his little sister more and more after meeting her. He was practically inseparable from her. Wrapped in love, Okkotsu Ai happily narrowed her eyes. So this was what made the idea that "a little sister is the world's greatest treasure" so heartwarming. Nen Ability: The Incredible Frontispiece. Effect One: The Host can freely alter the data of their reincarnated body. Unfathomable words were clearly written on the black-and-red frontispiece. [Irresistible charm.] Desire can arise from feelings that aren't pure love. For [A], a creature that feeds on desire, this world... Was absolutely fascinating. As Okkotsu Ai grew increasingly unsatisfied with her family's love, she discovered the other side of the world. Negative emotions filled it to the point that her desires ran rampant. For Okkotsu Ai, a [Desire-Dependent Being], it was like falling into a [buffet] where new dishes kept appearing. [A] was a greedy creature that could never be satisfied. Every desire was on its menu. Okkotsu Ai wanted everything, but she didn't like being crude. She wanted to eat this world with grace and good manners... "I wish for my child not to be bound by the Zenin." The black-haired man, his left side shattered, spoke to the creature hiding beneath his shadow. His wish granted, the man's body crashed to the ground. The girl hurrying toward him suddenly had black holes for eyes, and a sinister smile curled her lips. The Incredible Frontispiece. Effect Two: After granting a wish, the Host gains some of the wisher's possessions. Ai, now possessing the special physical abilities of Heavenly Restriction, sat on the black-haired man's shoulder. Half a month later, the Zenin family found their way back to the [ancestor] named Megumi. This world, overflowing with negative emotions, was the restaurant [A] liked best. Having grown tired of the [buffet], Ai planned to enjoy a [state banquet]. "Give me your brain." Standing before a man with stitches across his head, Okkotsu Ai held out both hands. The brain in question, drenched in sweat: What the hell is this thing? "Give me your malice." The blue-haired curse, its body covered in stitches, turned and ran. "Give me your technique." The cult leader wearing Gojo robes: ...This isn't the sorcerer I wanted! "Give me your eyes." The schoolteacher wearing a blindfold: ??? Waaaah, Ai-chan doesn't love me anymore. "Give me your soul." The King of Curses, provoked, laughed furiously and broke free of his vessel. Faced with Okkotsu Ai's demands, everyone cried: Aah, she wants my life, but she's so cute and I like her so much! I don't want to refuse her at all! The CP will be decided in the extras. No shipping bets. Reader's Guide: OOC and characters are dumbed down + lots of headcanons + logic optional + an original little sister for Okkotsu Maxed-out charm + leans toward a beloved-by-all group dynamic + not recommended for Rika fans Lots of cheat powers + leveling-up early on, invincible later Not a full redemption story + low empathy + chaotic fun-loving troublemaker Purely familial feelings with Yuta + no unsolicited writing advice Mainly Jujutsu Kaisen, with Hunter x Hunter as background The protagonist sometimes forces others to comply Theme: Face your own desires