The story is about members of a private military company (PMC) working in the polluted world after a war. The characters are involved in the confliction between the official army and their PMC and the conspiracy behind the curtain.
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The story takes place in the middle of 21st century. After a world war, cities are isolated from each other. Fort Diba City is one of the most prosperous cities and the security of the city is mainteined by a private military company Alcon Global Security. The unit "Viper" is a team of the guards of Alcon and the members carry out their jobs with the assistance of the operators. Sakurako is newly enrolled in the company and assigned to the operator for a member of "Viper" unit, Saiki.