Waltz and Schwartz, separated from the swordsmen and the energies, were the parts of the equipment they built that hit the vent - the "duct” - that leads to the world tree, from the one for burning the tree. Apparently, Waltz intends to install insecticides there and evaporate them using the hot air sent by the

Waltz opened the simple door that was provided for getting there or not or for that duct. Well, even when I say doors, they're just planks, to plug holes in ducts.

"Well. Well, I'm going to put some insecticides here, containers for evaporating insecticides...... what am I going to do?

"............"?

Hearing Waltz's inquiry, Schwartz tilted his head and thoughts and tentacles --

"............"

—— and spit something somewhat like a metal barrel (10 liters) out of the tip of its tentacles. Apparently, he decided, in reaction to the word ”container” in Waltz, to put out a container containing insecticides.

"Hmm? I thought we should heat each of these containers?

"............"

"Hey...... Well, the container itself is metal, and if you remove the lid, you might be able to use it as it is."

"………"

Every time Waltz talks, he looks happy somewhere, neck (?) Shvar shaking. The meaning of her actions is passed on to Waltz, and she realizes she's helping, and she's happy, and so on.

"This can was made by Lucia, right?

".................."

"Oh, well. Catalina was there, too, so you used junction magic, and the two of us made it together, right? Then take this..."

Bocco!

"And open up... hey, Schwartz? Two at the top, I'm going to heat it up, so can you get another one out?

"............"? Damn...

"Yes, thank you. Then open the lid too..."

Bocco!

"... Well, here's the thing. Well, we'll close the window, won't we?

Waltz said so, closing the lid on the duct. Safely, into the duct, they finished installing the insecticide.

Then they returned the way that they had come earlier to the part of the duct that was connected to the swordsmen that was a little thicker. It's part of the "blower" Waltz used to make at some point.

Waltz opened the small window that was there and threw his voice toward it. Ahead of that voice are the swordsmen who would be setting fire on the other side of the duct.

"What, swordsmen? Alive?

and waltz (?), waltz to make sure you're ready.

Then, echoing through the duct, the swordsmen's voice returned.

"For once, we're on fire." I haven't got the firepower yet. "

"I lit it with a laser for welding."

"Sister, I want an extra micromachine too!

"Oh? Okay. Okay? In many ways, huh? Well, I'm going to turn the blower slowly now, so be careful not to get involved, okay? And maybe the bonfire won't blow out, haven't you seen it properly?

"Oh, okay."

"Whoa."

Okay?

"Well, let's go, shall we?

When Waltz said so, he hung his hand on the relatively large crank that was provided on the wall of the duct and slowly began to turn it.

Its wooden crank leads to the windmill that was installed inside the duct via several simple gears…. Behind the window the waltzes were peeking at, it seems they started spinning giant windmills. Waltz seems to intend to use that windmill to send insecticides down to the depths of a bug hole made in the world tree.

As a result, it won't be long ——

Bwah!

—— and smoke flows vigorously through the peek window of the duct that Waltz was opening, albeit still thin. Apparently, the device works exactly as she thought it would.

It just didn't seem like everything was what she thought.

"Hopefully this incendiary will cause less oxygen in the air flowing through the ducts... I wonder what will actually happen?

"............"?

"What do you mean,"? When I try to pump air in like this, I think the outside air comes in through gaps and stuff, and there's not as much oxygen as I thought. Well, I think the synergy between smoke and diluted insecticides can exorcise quite a few bugs... so far, you don't know if you have to try. "

"…………" …

"... could it have been a little difficult for you?

"............" all over!

"Yes. That's Catalina's son, isn't it?

"………"!

Shake your body or neck against Waltz's words (?) or shake...... Schwartz looking desperate and trying to communicate his will.

Waltz, by contrast, though he saw Schwartz's behavior and showed a bare gesture like he understood what he was trying to say... It can be uncertain, in fact, whether communication of will had really been established.

It's just, well, to the exchange between the two of us, seeing that there was no gibberish... Perhaps it was well communicated.