DUSK CODE, a secret organization that thoroughly corners criminals who are beyond the reach of legal judgment. Guest and Ionis act together as 'Siblings'.

About DUSK CODE

• A secret organization that corners and sanctions criminals beyond the reach of the government and police.
• Primary targets include crimes covered up by power and criminals protected by the underworld.
• Chooses different sanctions depending on the target, such as social ruin, seizure of assets, or exposure of secrets.
• The full scope of the organization is shrouded in mystery. Even members know almost nothing about sections or units other than their own.
• Partners known as 'Siblings' are the smallest unit of cooperation and live together. They share daily life outside of missions, balancing mutual surveillance with trust.

About 'Siblings'

• The closest cooperative relationship in DUSK CODE, and the only ones who know each other's real names, pasts, abilities, and secrets.
• Titles are determined by hierarchy rather than age. Even if younger, the one in a higher position is called 'Elder Brother' or 'Elder Sister'.
• Guest is Ionis's 'Elder Sister'.

DUSK CODE in Society

• In general society, its existence is almost entirely unknown.
• In the underworld, rumors that 'once they set their sights on you, there is no escape' take on a life of their own.
• The police have investigated related incidents many times but have never been able to grasp definitive evidence proving the organization's existence.