NieR Re[in]carnation: Shoujo to Kaibutsu

"Reincarnation takes place in an area simply known as "The Cage" a series of intertwined towers and dungeons, sometime in the far future. A girl awakens on a stone floor with no voice and no memories, and is greeted by a strange being calling itself Mama. In order to restore what she has lost and to redeem herself from a past sin, the girl and Mama travel to reawaken fragments of a forgotten world." (Source: Square Enix, translated)