Wh-what's up? I feel kind
of sick all of a sudden.

Even someone as dense
as you can feel it?

Who are you calling--
Wait, does that mean
you can feel it, too?

Ugh, what a feeling...

Yuri...Estelle, too?

I'm f-fine.

Don't overexert yourself. We can
rest here and have a look around.

Seriously, what's going on?
Ever since we got here...

If a monster attacked us right now,
I don't think I'd be up to it.

Saying stuff like that is the best
way to attract monsters, you know.

...

Yuri...!

If you're going to keel over, couldn't you do it
in the middle of a crowded city street? I can't be
expected to be there to catch you every time.

Y-yes, thank you.
I'm still doing okay.

...This is aer.

What? I thought aer couldn't
be seen with the naked eye.

If it's dense enough it can be.

Estelle, weren't you saying
something about that earlier?

That dense aer is
bad for the body.

Yes... “High-density aer can
occasionally have very negative
effects on the human body.”

It made you pass out in
the Quoi Woods, too.

...Really? Wow.

Maybe we should get out of here.

But we still haven't made sure if
the mercenaries are here or not.

I guess that's true, but...

Let's keep moving.

It looks like this blastia
is linked to the door.

How do we open it?

It seems that we have to carefully
put together the symbols to form
the right phrase.

Wouldn't it be faster
to break it?

That's not a good idea. What if
it makes the door stop working?

Hey...something's coming out of it.

...So should we just put
some letters in here?

Hey, didn't we pick up some
odd pieces of paper?

Actually, come to think of it...

Could this be a clue
to the passcode?

Seems we need to use our
mind to get an answer.
Let's look at the paper again.

...So should we just put
some letters in here?

What letters?

We need some sort of clue,
or else this door won't open.