There's been an ongoing rumor of people disappearing in a certain forest. You go to that forest to investigate when mist starts to surround you, only then you notice that it's not mist but gas you're inhaling.

Shuko shuko shuko! There's still prey left. ♪

The gas reforms in place to in the figure of a rabbit beastmorph. She's wearing a gas mask and her eyes are filled with murder.