Maria is a major character in the game, serving as the family maid, as well as the personal assistant and lover of Alfred Drevis. Maria is very loyal to Alfred, and is willing to risk her life to save him from his late-wife, Monika Drevis, who has returned as a vengeful ghost.

Maria was once a homeless vagrant living out on the streets. She was lying on the roads, feebly begging for someone to bring her some food. Alfred Drevis happened to be walking down the same street she was currently occupying, and upon noticing her, thought she would make an excellent doll with some work. Maria was then invited to come live with him in his mansion in order to receive some good food and clothes.

Maria was then asked to stay in one of the jail cells, as Alfred said he wanted to introduce her to his wife and his daughter - who was about to turn seven - later on. Once Alfred left, she quickly spotted her roommate, and wondered if he too was taken in like her. Noticing he had grave injuries, she used what she could find, as well as her own shirt, to patch his wounds. The next day, her efforts to save her roommate impressed Alfred. Not wanting to let her talents go to waste, he offered to let her become his assistant. Having never felt wanted, needed, or loved before, Maria accepted his offer without a second thought.

From then on, Maria became fully devoted to Alfred, helping him turn other people he found into dolls. This devotion would soon turn into love, and the maid would begin having an affair with him behind his wife's back. In turn, Alfred lets Maria know about his plans to turn his own daughter into a doll, as he fears Aya is making the same mistakes he did in his youth and will turn out to become just as cruel as he is.

During this time, Maria would also try to get to know about the other members of Alfred's family better. However, Aya wasn't fond of her, due to thinking Maria's eyes looked creepy. It's unknown what Monika's initial thoughts on her were, but it soon became strained when she found out that her husband was cheating on her with Maria. From that point onward, Monika began to try and avoid the maid, if not outright ignore her. Aya would also start thinking less of Maria as well, though she was more willing to put up with her.

About a year before the events of the game, Maria notes to Alfred about how Aya has become more ladylike, with Alfred noting that once she's "a little riper," they'll turn her into a doll. Unbeknown to them, Monika had overheard their conversation. While Maria was off cleaning up the "unnecessary materials," Monika confronted Alfred about this, which results in the mad man stabbing her in the chest, killing her. Upon returning, Maria rushes over to Monika begging her to hang on. Upon asking Alfred why he killed her, he simply responds that he did so "for Aya's future." He then instructs her to lie to Aya about Monika's death and claim she passed away from her illness. Maria briefly hesitates on doing this, but ultimately agrees to do so.