This is just a simple, utterly cliché transmigration story.
Lia, female, has read Hunter x Hunter, and is a well-adjusted young adult from the twenty-first century... just kidding.
Before transmigrating, she was the sort who took life as it came: if she could lie down, she never stood; if she could stand, she never walked; if she could walk, she never ran. A terminal case of laziness. But she is fiercely protective of her own...
Unlike other transmigration stories, where people end up as local characters like Illumi, Alluka, or Killua, or as original characters like Killua's twin sister, she...
transmigrated as Nanika :)
That's right, the "Holy Grail" from the story, the one who can grant any wish...
And that's not all...
When the transmigration deity sent her over... it accidentally picked the wrong target...
So...
She's inside Killua now...
The protagonist had already accepted her fate and planned to transmigrate, coax (lure) and kidnap a little girl [not really] into running away from home, then go wild around the world. But now: "Wait, how am I supposed to handle this plot?!"
Wow, this subject is very interesting, please do more!
The setting is very interesting, thank you very much^ω^
Come back and update! What a waste of such a good subject matter.