I couldn't find a topic asking this, but please delete if there has already been one.
After a demon eats a soul, what happens to the soul? Does it just disappear from existence? I remember in the anime, Luca was able to talk through Hannah. And then Luca and Alois were talking at the end after Hannah ate his soul too. But I don't quite understand how it works, because that doesn't really seem like 'eating' to me. Does the soul 'live' inside the demon or is it destroyed completely after it's been consumed?
I don't think it's ever been said but I'd like to hear your thoughts.