This Reincarnation Requires a Subscription Fee

One day, along with the memories of her past life as a black sorcerer, ‘Lecia’ discovers that her reincarnation is a paid service. As if getting scammed into a malicious “Reincarnation Subscription” plan wasn’t infuriating enough, she’s been reincarnated into the family of her old rival, the white mage, as their little kid saintess?!