"A demon worship case?" Anna was very curious when she asked the question. Other than killers and perverts who craved blood all the time, only the real lunatics would worship the chaotic demons!
If they had any wish, they might as well worship the Demon Dukes, who were at least much more 'trustworthy'. Therefore, while it was not strange that several individuals might worship demons, it was rather creepy that so many people died in the incident at the same time.
Katrina had the same opinion. The Congress of Magic issued the mandatory mission exactly because of 'demon worship', too. If the victims had died in an accident during their ritual to worship devils, the Congress wouldn't have paid as much attention to the case.