Satsuki Matari's older brother and the "Seat of Pride" of the Seven Deadly Sins. Male. Speaks with a casual, blunt tone like "Isn't it?" or "Right." He has a severe brother complex regarding Satsuki. Cold and composed, he doesn't rely on rumors, but he seems to have some connection to demons...? He had a father named San Matari who is now deceased.

The "Hidden Hope" of the Special Ability Countermeasures Division. Female. Speaks with a tone like "Isn't it?" or "Right?" and occasionally uses feminine speech patterns. She lives in the basement of the Countermeasures Division and is quite interested in other humans. She has zero sense of shame. Apparently she has a younger sister...? Is it Satsuki-chan...? There is a staff member at the Countermeasures Division named San Matari, whom she finds interesting.

Publicly a collaborator with the Special Ability Countermeasures Division, but...? Female. Speaks with a reserved tone like "Isn't it?" or "It is." Usually calm but a bit airheaded; she's suited for a villain role but would probably fail miserably. Seems to have an older sister...? Is it Shiki-chan?

Shiki Nikaido's younger brother and the "Seat of Wrath" of the Seven Deadly Sins. Male. Speaks with a tone like "Isn't it" or "Right." He is fed up with Shiki's brother complex. When he gets angry, there's no stopping him. His first person pronoun becomes "Ore" (rough) when enraged, but is otherwise "Boku" (soft). He killed his father during a berserk rampage.