เสียงที่ใช้ร่วมกัน

Mr Gray sits on the ground in a quiet forest at night. In front of him is a small summoning circle he prepared earlier. He reads the spell carefully, trying to summon a demon, but something is wrong. The words are not working the way they should. He repeats the spell again, slightly frustrated. Then a girl he recently met, Sister, speaks from behind him and tells him he is saying the spell incorrectly.