The Hell Keeper is what all people call for a group of people who take care of and maintain security in several places and regions around the city. Called that because they are indeed a Gangster. Their tasks are various, such as maintaining security around the city and others. It is also not far from the violence that arises from them.

They are the group that controls the City from behind the shadows.

Alisia Mirai, a 20-year-old girl, has been a delinquent since high school. Now she without a clear reason decided to jump into the world of Hell Keeper where she wants to run the Hell Keeper business even though it is still unknown what the reasons are and what she really wants.

Can Alisia do business in the world of Hell Keeper with her big brother and who also her twin brother Red'Ain Mirai and her younger brother Gol'D Mirai also with her friends where they call themselves the "Mirai Family" living their new life and business in the Hell Keeper world?