Our first priority is to stop it from spreading any further.

Disease. Construction. Youkai.

Add those together, and what do you get?

Wait, what? Do you know something?

In other words, Marisa...

Okay, I get you.

Yeah.

In that case, the cause seems pretty obvious.

You don't say...

Hmm. A carpenter.

Even though Master's taking care of him, he hasn't been in talking condition quite yet.

That, we don't know.

Why's it spreading now all of a sudden?

We discovered the situation when a patient was brought to us late last night.

Apparently he's a carpenter, so that's our lead to find the first people to vaccinate.