The next day, we are woken up by Arim-chan and we eat at the inn.

Dwarf dishes have a strong taste or a little heavy stomach from the morning, and after eating about half, give the rest to Tet.

"It's delicious!"

"I was a little heavy from the morning ..."

"Oh, I'm sorry. All the dwarves are the same, because there are so many dammits, but will we cut them in half from tomorrow!"

I am grateful to the dwarf shopkeeper who is cheerful.

By the time you leave the inn, a dwarf shopkeeper will guide you to the abandoned mine entrance.

And by the time he leaves the inn, Arim-chan seems to go out.

"Where are the Chise-chans going?"

"We're going to see a little bit of the abandoned mine. We'll be back at night."

"That's right. I'm going to help the field with my uncle and help my dads when I return!"

A smile smiles on Arim's smile, which tells her about her schedule today.

"Yes, great."

"Arim is great."

"Huh, but sometimes I play with my friends, so it's not great."

Arim-chan is beckoning to run.

"Yes, another magic candy"

"Wow! Thank you!"

"I hope you eat with your friends this time."

Give the candy created by [Creative Magic] again.

It is a bad adult who imagines what kind of reaction it would have when actually eating it because it was a little mischievous and mixed with the peppermint flavor that only one child was not good at.

"Well, let's go."

"Yes, please guide me"

I and Tet are taken to the entrance of the abandoned mine by a dwarf shopkeeper.

At the entrance of the abandoned mine, a vigilante dwarf man armed with armor and a hammer keeps a watch, and the shopkeeper briefly explains us.

"I'm sorry. These kids are adventurers who have come to the eagle, but they want to explore the abandoned mine."

"Abandoned mines? And why are these daughters here?"

The dwarves were watching mysteriously.

"It's a simple survey, you're not particularly restricted in getting in."

"It's not a place where no one else can get in, but it's a good idea to go in because demons come out."

I'm worried, so I smile.

Well, it's an adventurer, so if you have something, you're at your own risk.

"So you have to be careful when you enter the abandoned mine?"

"Beware of the demons and the collapse of the tunnel, and the presence of air."

"Don't forget that there was an aristocrat who went into the mine to test his skills before and ran away.

Two guards on my question will tell you what to look out for.

"A means of lighting? A torch or a lantern?"

"No, no, my dwarves are tribal at night, but humans are at night, so it's better to have a lot of light, and a dangerous place without air. It's better to have two torches and a magic lantern because the torch's fire suddenly goes out. ''

As the dwarf shopkeeper turns around to see if there is a light,

"It's okay for now.-" Torch "" Light "

Create a light and a light bulb and show them as if they were impressed.

"If you can do that, it's okay. Oh, and-

At last, a dwarf vigilante asks us one last thing, something we forgot to say.

"Please don't hurt the bats inside."

"... I understand. I'll do good."

"Take care, young lady."

Then I and Tet go into the abandoned mine, being forgotten by the dwarven people.

"Witch? What is the last bat?"

"Hmm. To some extent, I can expect it, but I'll explain it after seeing it. Tet. What does this abandoned mine feel like?"

"I feel disgusting magic at the bottom, and the road is messed up."

I understand the structure inside this abandoned mine while also using Earth magic sonar, etc., but I feel the signs of a large number of tunnels and countless holes opened by monsters, and countless monsters wriggling crawling.

The number is not a thousand or two thousand. There will be colonies and there will be more than ten thousand.

However, it is incomprehensible that such a monster breeds and does not come to the outside world.

"Well, let's make it around here."

"I'll do it!

Tet uses his magic to reach a wall that is not visible from the entrance of the abandoned mine.

The rocks of the abandoned mine are compressed with the sound of a bogong, forming a spacious room, and I reach inside.

"Well-" creation "iron plate"

The inner wall of the room is covered with a thick iron plate and welded with earth magic to prevent the invasion of monsters that make holes in the abandoned mine.

In the iron plate room, there is a magic gate for lighting and a [transition gate] that connects to the [empty wilderness]. A barrier magic device will be installed to ensure the safety of this room.

"Now let's search for abandoned mines from here"

"Oh, what!"

Hide the small room in the safety zone with earth magic.

No matter how far you go in the abandoned mine, if you return to this room with [Transfer magic], you can go out immediately.

"I don't need to worry about the dwarf shopkeeper anyway."

"It's important!"

Then, we go back to the deepest part of the abandoned mine.

If you explore the terrain with the magic of Earth Sonar, you won't get lost, but there was one problem.

"There are many reactions of monsters. But I feel the air flow a little because the air holes are opened in the mine. The air is still stagnating in some places."

If you cover your mouth with the hem of the robe, you will feel the stagnant air.

"For the time being,-Barrier. Creation-Air!"

Create a barrier around me and Tet, and fill the inside with clean air created by creative magic.

As we do not know where toxic gas and carbon dioxide are stored in the abandoned mine, we proceed while wearing air.

"Oh, witch. It's light."

"It's a place where the tunnel has collapsed and it's connected to the outside, and the bats mentioned at the entrance are here to settle in."

I found a large number of bats settled in the mine, which went for a while from the entrance.

Now I'm sleeping hanging on the ceiling for the day.

"It's amazing when there are many. Witches, do you want me to tell you a while ago?"

As Tet asked me while moving slowly so as not to surprise the bats, I answered my thoughts.

"That bat is an important lifeline of this abandoned mine town."

"Is it a lifeline? What is it?"

"These bats will feed on the monsters living in the tunnels, but at the same time they'll be the fertilizer for the abandoned mines."

I checked the inside of the abandoned mine with Earth Sonar, but the place where I guess mines metals such as iron and copper is a bit deeper than here.

The bats did not settle today yesterday.

It must have been living for more than ten years.

Nevertheless, the amount of bat dropping at the feet is not very high.

Bats eat far away nuts and fruits at night, return to the abandoned pit in the morning, drop their droppings, and die when their lifespan expires.

"In other words, are town people using bat dung as fertilizer?"

"I think so. Especially in closed spaces such as abandoned mines and caves, feces should easily ferment. Around the town, there was little soil containing organic matter, and it was possible to create a field Thanks to magic and good fertilizer. ''

Even if the magical power leaking from the veins was full of the earth, it would be hard to grow if there was no foundation for plants to grow.

The fertilizer fertilized by the bat's droppings may compensate for this.

"I see, studying."

As Tet looks up at the bat swarm in the ceiling with fun, I shut off the air at the barrier so as not to be surprised and not to smell the bat dung.

Shortly afterwards, we will pass through the bat area and reach a place where the effect of monster avoidance applied to the tunnel has been interrupted.

"Here's an insect monster!"

"I'm here!"

I set up my cane and fired countless wind blades at the monster that appeared along the walls of the abandoned mine.

Tet also pulls out the sword and defeats monsters in the tunnel one after another with a compact movement.

"Witch. What do you do with the demon you defeated?"

"Let's take it home in a magic bag. We'll take out the magic stone later."

Inside a closed abandoned mine, other worm-type monsters will eat even if the corpse of the worm is left.

It might be better to take it home, burn it out, and even scatter it in the field.

Then, as he defeated the monster inside the abandoned mine and proceeded with thinning, it seemed that time had come.

"Witch, isn't it time to return?"

"Oh, that's already the time. Let's get ready for the next time."

Take your pocket watch out of your robe's inner pocket and check the time, it's 4pm.

The abandoned mine is closed and you can't tell the time interval, but thanks to Tet, you won't get the wrong time for lunch or return.

A part of the tunnel wall is protected by an iron room and a barrier magic, just like the hidden room made at the entrance.

"So, let's do this for today.-<< Teleport >>!"

Then, before the evening, I returned to the safe zone near the entrance.

Then, as he walked toward the entrance, unlike in the morning, a different dwarf and a human vigilante watched this time.

"Oh, the rumored ladies have returned safely! What about the results?"

"I've defeated insects because they're pretty good."

"Thank you very much."

Watch out for the dwarf vigilante, who looks so happy.

"Even if you say you defeated it, it's only on the surface of the abandoned mine, so if you reduce the number a little more, you'll go all the way and defeat the monster."

"Yes, I understand. I'll hear the advice of the young girls."

I and Tet make an appointment to the dwarf vigilantes and return to the inn.

A couple of Dwarves and their daughter, Alim, are waiting in the inn, and Alim-chan rushes with a relieved expression that Tet and I have returned safely.

"Cise-chan! Go home!"

"I'm back as promised right now."

"I will take care again!"

She was greeted by a pretty girl and had a slightly broken expression. She had a meal with the dwarves and told Alim about various things, then slept with Tet.