Two Destinies, Two Worlds, One Genius that Shakes the Universe

Imagine two girls with extraordinary destinies, separated by dimensions, yet connected by the red thread of mystery and unexpected genius!

First, meet Rheine Nikarai. A miserable girl whose life was filled with suffering in a cruel world, enslaved by her own adoptive parents and even sold like merchandise! After enduring physical and mental torture that would make you cry tears of blood, fate brought her to a heroic death... only to wake up in a fantasy world full of magic?! But instead of becoming an OP wizard, she finds herself trapped in the body of a 7-year-old kid WITHOUT being able to use magic at all!

Meanwhile, in another world, there's Unelea Rika, who works as a detective investigating a murder case secretly committed by Rheine. One day, she receives a letter from Rheine just before her death. That letter leads Leaa to die and meet Rheine directly.