Two years prior, during the events of 428: In a Blockaded Shibuya, she was abducted by terrorists and was infected with the Ua virus, surviving the ordeal only thanks to the anti-virus her father developed. She befriended Canaan after being saved from hoodlums during a trip somewhere in the Middle East. As her dream is to become a photographer, she became the partner of Minoru Minorikawa before the pair's assignment in Shanghai and her subsequent reuniting with Canaan.
Despite being aware of Canaan's dangerous life, Maria tries her best to stay close to her friend. Just as much as Canaan protects Maria, Maria protects Canaan by emotionally supporting her. Maria, who grasps human emotions far better than Canaan is able to comfort Canaan with the fact that Maria is naturally very kind.
Maria, too, describes Canaan as her own guiding light in her quest to be strong. Though often playing the role of a damsel-in-distress, she wants to be one day able to support Canaan and is just as strong-willed as Canaan can be. At the end of the day Maria is witty and, even though being both afraid of and curious about Alphard at the same time, won't hesitate to see the inevitable showdown between Canaan and Alphard unfolding through the end.