The Moonlight Bridge is a location in Persona 3.
10 years prior to the events of Persona 3, in 1999, the Kirijo Group performed experiments on Shadows on Port Island. By mass collecting Shadows, Death was awakened and escaped the facility it was in and wandered around the city.
Eventually, Aigis, an anti-Shadow weapon, caught up with Death. She sealed Death into the Protagonist / Female Protagonist. However, the battle between Aigis and Death resulted in a vehicle accident which killed the Protagonist's parents.
On December 2nd, Aigis fights Death again, in the form of Ryoji Mochizuki.