That is... that is incredible. With a spear, no less?! Incredibly barbaric. And prison? There must have been a mistake. Surely you could not have done anything so serious to receive such a punishment.
Do you, at least, know if it was for... a good reason? Granted: killing should be a last resort. Self-defense. Were you defending yourself from something?
The past? It... well, I do not know. I cannot judge you on that.
If there was a good reason, then no doubt you did it with equally good intentions. But for them to be able to speak, means there might have been some kind of logic behind their own antagonistic ways.
You are amazing, Nanashi. But please do that if you decide to come to the cafe as well, I do not know how the other customers will deal with demons. Heck, what if they feel the need to kill a demon? I cannot imagine demon blood comes out of fabric any easier than human blood...