The five men who are standing in front of the Romulus dungeon are a party of those who are called brave men in this world. As the adventurers who challenged the dungeon were kept abreast of each other, they came at the request of Barren's Adventurer Guild for nomination, which focused on the situation. The request is for investigation and hazard assessment of the new dungeon. The brave men went into the dungeon confidently.

"That's a narrow, painful dungeon. You're finally walking."

"Oh, that sounds like a freshly made dungeon. The treasures will have low expectations."

"Kite, Duncan, take it seriously. It's gotta be a dungeon, no matter how much you shove, 'cause if you look sweet, you'll get hurt."

"But, Maria, is this really a dungeon? I've never seen such a narrow and painful dungeon."

"No, it must be a dungeon. If you look at the wall, you'll see."

"Surely it's not just a rock wall. Not as scratchy as a little slap."

"But there's nothing else that sounds like a dungeon... whoops!

"Flynn, are you okay? Careful with the scaffolding."

"Oh, I'm fine. As we continue, and this is going on for twenty minutes, I'm a little concerned that monsters, traps, and even other animals don't show up."

"Sure, it's just so crooked, it's like a goblin's going to come over one of those surprise raids, but there's no sign of it."

"Don't be alarmed, proceed with caution"

"Or something like that. It's another bend from by your side. Every time I run into a corner, I send Gil out for reconnaissance, and I'm back and I'm waiting, so it's gonna take me a while."

"Well, it's not a bad idea to have a lot of appearances as a scout... just don't get mentally tired of all this emptiness on top of a lot of times"

"Outreach That might be the aim. Don't be careless."

"Wait a minute, we're splitting up again"

"Again? How the hell are you in this dungeon? Are you sure you were freshly made?

"It's definitely new because it's appeared in a place where there's never been a record before."

"Gil, how's the mapping going?

"No. You can't climb up and down like this and wake them up on a map."

"Only the thread that has stretched instead of the landmark is literally the outline of a favor"

"That's good news for you. There's no more thread left."

"Seriously...... what do you do"

"... let's turn back. It's a dungeon that's gotten us this far. It's reckless to go any further without a mark."

I'm sorry, but I can't help it.

"Whoa! The yarn's gone! There's no sign of him!

"I'm not kidding! You're lost in here!

"Damn, that's a bad dungeon for them. Maria, can't you read the magic flow?

"No, you can't. This dungeon has an unstable amount of magic in the background. I don't know where (or where) I'll be lured if I follow the flow."

"When this happens, we can only rely on everyone's memory..."

"Any footprints? You don't have any left?

"No. I just checked, and that letter in the footprint doesn't even leave a mark."

"The lights are getting thinner too. Save as much as you can and move on."

"If you could at least come out with a monster or something, I could follow you and find a beast path..."

"Hey, we're out in the square."

"There wasn't a square like this when we got here. I thought you were going the wrong way..."

"There's nothing to complain about as long as I can get out, even if I'm here and on a different path..."

"But you're going to be able to stretch out your hands and feet and rest here. The road up to here was decompromising, with bad scaffolding, and not a resting terrain."

"Let's take a short pause here."

"Aren't you allowed to rest like this anymore?

"Well... do you want to set up a watch and camp for once"

"Need a lookout? You didn't see one of the cat kids, did you?

It could be nocturnal.

"It would have been like night so far..."

"Master Crowe, the brave men have entered the land of examples."

'Well, that sounds like a convenient way to camp. Pour in a little bit of carbonated gas so there's no air.'

'It's understanding. But this carbonated gas? Really? You're gonna die so easily.'

"Oh, it's colorless, odorless, so hard to notice, it's an excellent thing to kill clean"

Carbonated gases, though common to nature, do not neglect the dangers of carbon dioxide. The concentrations of carbonated gases contained in the atmosphere are extremely trace, and on Earth their concentrations are only 0.036 percent. But when this is five percent, you get headaches, palpitations, sore throats, and in ten percent, you get tinnitus and tremors, and you lose consciousness in about a minute. Crowe was showing and explaining videos of animal experiments so the Cores could be convinced. Because carbonated gases are heavier than air, it is known that humans and animals entering accumulated holes, pits, etc., will be sacrificed.

"What... my tinnitus... my hands are shaking! Whoa, wake up!

The brave man who was up for the lookout notices the anomaly. No, it's a favorite decision to wake up a fellow. When the carbonated gas reaches twenty-five percent, it becomes anesthetic, and when left alone, it dies. Other faces jumped up and escaped without questioning the quality (just) of the situation. I guess that means you're treading quite a few places.

"Dear Crowe, the brave party has been broken up"

Is that what I thought? It was unfortunate that it could not be stopped with carbonated gas, but even if it was not unconscious, it could blunt judgment with gas. On top of that, if you get out in the dark urgently, you don't have time to chirp or rendezvous. There are many paths around the square, so you can't tell which path you took. The road is bent in seven bends. In a state of haste to escape, it is not possible to confirm the precedence.

"The three scouts, magicians and recoverers are together, but the rest are split,"

"Parties-like members share their roles, because when you split them up, they lose their functionality all at once. Then it will be about how to break up the party. If your head is decent, you can take fools like splitting it between your hands. Until your head doesn't work properly. '

"Shit, you seem to be falling apart. Kites, I hope you're okay."

"What is it, suddenly? I didn't feel any magic..."

"Is it a curse or something...? Looks fine now, but for once, do you want to recover?

"No, you won't have to. Keep your powers warm."

"You don't seem to understand the cause."

"It's a colorless, odorless gas attack in the dark, I can't help it. You might not know the very concept of gas in the first place. '

'I didn't know either until I taught Master Crowe. And you're a good fit.'

'Cause it works better in a place as narrow and tight as here. I've been thinking about it for a long time, and it seems to have hit me well'

Carbon dioxide is present in higher concentrations in volcanic gas, but since there were no volcanic ranges likely to be used in certain positions in the dungeon, Crowe was bringing in gas cylinders from Earth. In future, we are considering whether to synthesize with magic or replace it with poisons other than carbonated gases.

"Now, brave man, where are you going next?