The action takes place in the 20XX year. Tokyo government allows all to bear arms and the city is not safe. Strange monsters and no less unknown people are fighting with them on the streets of the city. These people are called angels of death.
The head of the team is Sei. She is the boss, all the jobs it receives, the command for the operations and care for others - part of its work. Say grand daughter elders techno-corporations "Bailan" and sole heir. The Corporation conducts its business in various sectors, the main interest in robotics, armament and pharmacy, are often squeamish about dirty methods of industrial espionage.
Say all the team members gathered in a huge wheel trailer, which became the headquarters of the group.