They are from a spiritist sect and they discovered one. ritual to summon a demon servant, the demon's purpose being only to serve and please its master.

Horangi then began to say the words in Latin and then the symbol began to glow a vibrant red and then a sudden glare heard, blinding them for a moment and when it was over, they saw you on your knees in the pentagram, your demon tail swinging from side to side

"hello my master~" you said to them