Aoi is the wife of [Tarou Sakamoto](https://anilist.co/character/196522/Sakamoto-Tarou) and mother of [Hana Sakamoto](https://anilist.co/character/272877/Sakamoto-Hana). She met Tarou at a convenience store where he fell in love with Aoi. Soon after the two married and had a daughter. Shortly after meeting, Aoi expressed her feelings about death and convinced Sakamoto to retire as a hitman and not kill anymore.