Harrison explained himself, noticing the shift in Sabrina.
"Your Father was working on a mission for the Association, which was to infiltrate the Abyss and gather information. The Association has quite a few spies, like your Father in the Abyssal Layer 555. Your Father, Robert, was among the best we had.
His mission was simple, it was to investigate the seven cities in the Abyssal layer 555, the key figures of the Martial Star's army, and any other 'peculiarities' within the Abyss, ones that we could use to our advantage."
Demons consider the number seven to be 'holy' in some sort, they are deeply influenced by the seven deadly sins of Wrath, Gluttony, Envy, Greed, Sloth, Lust, and Pride. In all prosperous layers of the Abyss, where Demon Lords and other rulers reside, the number of cities does not exceed seven.
