The ocean?

Yes.

When I read books from the outside world in here, there are often descriptions of the ocean inside.

I'm a bit interested in learning what it's like.

After all, this Scarlet Devil Mansion used to be in the outside world, right?

Hmm, the Scarlet Devil Mansion doesn't have much of a connection with the ocean.

Since vampires are bad with running water and all...

HAWAII

Ah! Now that you mention it...

Ah! However, we do have an ocean here.

Eh!? By "here", you mean...?