Maybe the mc is the real saintess in every life she's in (like even on the first life) but her powers we're sucked out and absorbed by the oh-so-called saintess on the first life, Diana. Maybe Diana is using black magic cause her power is not that much and gain healing powers from others in orphanage or temple.
Maybe that's why mc is reincarnated by the goddess herself to make the world right without being engulfed by the evil sprits this time.
Maybe the mc is the real saintess in every life she's in (like even on the first life) but her powers we're sucked out and absorbed by the oh-so-called saintess on the first life, Diana. Maybe Diana is using black magic cause her power is not that much and gain healing powers from others in orphanage or temple.
Maybe that's why mc is reincarnated by the goddess herself to make the world right without being engulfed by the evil sprits this time.