Mary is a young engineer who does maintenance on extends. She is a friend of Juuzo's.

She performs back-alley maintenance on Extended in the mafia-controlled Kyusei Pit immigrant district, one of the few places in the city not under Berühren Corp control. She provides Juzo with medicated cigarettes after he loses access to his favorite brand. She became a mechanic in hopes of reuniting with her mechanic brother Victor who went missing during the war.