Freia is the daughter of AOF3's boss Wyler. She is also an old childhood friend of Robert Garcia and asked him to accompany her to Glass Hill, Mexico, where her father was experimenting with some sort of new drug.
In Robert's ending (which is most likely to be the canonical) it is revealed that she will stay in Mexico and care for Wyler, whose mind has been reverted to a childlike state as a side effect of the drug.
