There is a passageway at the back of the building, so walk down it.

To the left and right, there are thick silver walls. My intuition tells me that it is more like a laboratory than an ordinary office or house.

It looked like it was made of iron, but it was unclear whether iron was used or not.

'Do you want to open it?'

'Yes, I do. ...... Well, you never know what's out there, so be prepared just in case.'

Aleria tries to open the door.

She pushes and pulls, but it doesn't budge.

'Yuki, the door won't open! Is it possible that the door is locked?

'No, ...... probably not.'

I took over from Aleria and reached for the door.

If pushing and pulling doesn't work,......, try sliding it.

With a rattling ...... sound, the door opened.

'Wow! It's open!

'There are not only push and pull types of doors, but also sliding types. Well, you don't see many of them.

I hadn't seen a sliding door since I came to the other world.

I don't know if it's a cultural difference or a technological difference, but I can tell you that these doors are not modern.

I take the lead and enter the room.

Then--

Yeeee ......!

a bat-shaped demon roared.

There weren't just ten or twenty of them. There were more than ten or twenty of them, and so many of them that it became troublesome to count them, their eyes glittering.

I'm sure they weren't there before I entered the room, but--

'It's a monster house type trap,......, and it's nasty.

I'm not sure what to say, but I'm sure you'll understand.

'You look rather happy ......'.

What? You think so?

As for me, I think it's really nasty--'

I'm not sure what to do, but I'm going to do it.

A non-attribute flare wipes out any bats that come at you head-on.

It's a good idea to have a good idea of what you're doing.

'Look, ......, there's still half of them left, right?

'It's crazy that I can kill half of them in this instant!

'Hmm, but it's going to take a while from here.

It would be easier if they were all combined together, but with so many small demons scattered over such a large area, it would take a lot of time and effort to eradicate them.

I steadily reduced their numbers with flares and slashes, and Aina took down the isolated monsters.

It took about five minutes to eradicate the demons in the room.

The number of corpses was not that large, because the number of flares that burned them down was quite large.

I mean, they look like bats, so if you look at them closely, they're really creepy.

I might have thrown up if that many corpses had been left intact.

It's pretty amazing that they still attack us mentally even after death.

'What is this ......?

The room was not very large, but there was a small round table in the back.

Aina pointed to a book on the table.

'Looks like an old book. ...... quite old.'

It seems to have been stored for a long time, and has become quite oxidized.

The cover also had a lot of yellowing.

The book seems to be made of a high quality material, and does not fall apart when touched.

I flipped through the book.

'I wonder what it says, .......'

'I can't read it.

Neither of us seemed to be able to understand the contents of the book even when we looked inside.

Of course, I couldn't grasp what it said at all either.

It seems to have a slight resemblance to a continental lingua franca. However, the writing style, grammar and words are quite different.

If I did not understand the language, I could not understand it.

'I'll keep it for now. If I decipher it, I might be able to find out something about the time.'

I stuck the old book in the item slot.

It won't deteriorate and is safe to carry around.

When I get back to King's Landing, I'll have someone who's good at it decipher it.

'Come to think of it, there are several more rooms with similar doors, aren't there? It's a bit tedious, but we'll go through them one by one. ......'

I'm not sure what to do.

I spent about five minutes per room, going through the rooms one by one.

As expected, every room was a monster house, and we had to deal with a lot of monsters from the very beginning.

The strength of the monsters themselves was not that great, and even ordinary guards could manage to defeat them one-on-one. Nevertheless, I felt like going home.

There were six similar rooms in total.

I had just broken through the sixth and final room.

'There it is again! This time, the cover is black.'

Aleria happily picks up an old book on a round table and delivers it to me.

'Maybe it's a series. ...... Too bad I can't read it right now.'

The six old books all had similar bindings, but the covers were different colors.

They were red, blue, yellow, green, gray, and black.

The colors were faded from deterioration.

I made sure that all six books were stored in the item slots, and left the room.

The passage must have been still ahead of me.