A calm charm for youkai. There's no doubt, this was Rumia's.... I see. So someone peeled this off her, which made her violent.

Wouldn't it possible that she peeled it off herself?

Don't be stupid. How could you peel it off when you're being sealed? Someone peeled it off of Rumia, dissolving the seal, and then replaced it with a curse.

By dissolving this seal, they made Rumia go berserk and attack your village.

Whoever is behind this is responsible for all that's happened!