The long body has no visible limbs, and since it is a transparent light and shadow, there is no pattern similar to clothing, and the only recognizable thing is the collar tied tightly with a thin ribbon and the head with a double ponytail hairstyle like a thousand households, which is the existence that appeared in front of the three of them.

"Please come in!" Light and shadow invited.

"What should I do?" Chiho asked the two beside him.

"Do you want to go in?" Yuri asked the boy.

“………… Let's go inside! After all, to reach the top floor, this is a must............ And she'............"

The boy glanced at the light and shadow with his eyes.

“………… It should be friendly ............."

"So............ Can we get the car in? Qianhu asked.

"Absolutely! Please ............ yourself," Light and Shadow said with some joy, and even the circular marker on her head was constantly changing.

The three of them got back into the half-track and drove in through the gap between light and shadow.

"Speaking of which............ Why didn't we find this door just now? Yuri asked, sitting in the car.

"Because the lighthouse outside took away the electricity, the entrance couldn't be opened." Light and shadow explained.

"Why is there that lighthouse?" The boy began to ask questions.

"I guess it's to eliminate the notion of night!" Light and Shadow replied.

"Is it to make no distinction between day and night?"

"I guess so! ………… What a stupid idea! Light and shadow sarcastically.

"Huh! Wouldn't there be a lot of time for other things if there weren't nights? Yuri asked.

"Actually, it won't do any good............" Light and Shadow said denied.

"Why?"

"The discontinuity between day and night is very important, and cutting off people's consciousness based on rules is the only way to prevent people from ......falling into madness," Light and Shadow stood in front of the three of them to answer Yuri's question.

“………… What does that mean? Yuri turned to the thoughtful boy and asked.

"I guess if you give up sleep to do more work, you go crazy............" The teenager explained.

"That's it!" Light and Shadow affirmed.

"That............ We're actually looking for an elevator to get to the top floor............" Qianhu asked as he suddenly looked up at the light and shadow.

"Of course! ………… Here it is, I'll show you the way! After the light and shadow finished speaking, the cursor on his head changed into another shape.

"What's on your head?" Yuri asked, staring at the cursor on Light's head.

"Well...... This is a fixed piece...... It's an icon that shows my current status...... "Light and Shadow said as he led the way ahead.

“…… What the hell are you? It doesn't look like a machine or a living ............"

"And it's a little transparent......" Yuri asked as she followed Chino.

"The reason why it looks transparent is because it's a stereoscopic ............," said the light and shadow as they passed through the car, revealing half of their heads on the side of Nuko.

“nu！？” Nuko, who was resting on the car, was startled by the sudden appearance of a head in front of her.

Of course, there are also Yuri and Chiho, who are caught off guard.

"Hey, hey!" Chiho protested a little speechlessly against the mischief of light and shadow.

"Please go this way! Pay attention to the ............ under your feet, "After the light and shadow finish the prank, they will return to a serious lead mode!"

"And what do you do?"

"Management............ I'm the AI in charge of managing this tower, and although I am responsible for a lot of work, my basic role is to act as an intermediary between humans and machines............ Yes! Please go this way! ”

Chihu followed the guidance of the light and shadow, and drove out of a portal, and continued to move towards the path to the right.

“…… That is, to negotiate for the values of both sides and to lead in the direction of peace...... It's actually quite difficult to do............ "Light and Shadow continued.

"Na! Why do you stretch your body so long? Yuri asked, pointing to her elongated body of light and shadow.

"Because I'm so happy!" Light and Shadow replied.

"............" Qianhu was speechless and looked at the light and shadow that kept swinging back and forth above his head.

"I really haven't met anyone for a long time, although I have encountered a lot of things, and I am the one who closes the door...... The other five sisters haven't been in touch for a long time............" Light and Shadow explained as she passed her body through Yuri's raised hands and played.

"But it's always idle to be alone, right?" Yuri asked, leaning on the edge of the car after playing for a while.

"It's very idle! …… So I'm really happy, so it's finally ............" Light and Shadow muttered to himself and continued to lead the way ahead.

After the car continued to drive for some distance, a portal appeared in front of it.

"Turn right from here!" Light and Shadow pointed to the portal.

"Hmm!" Qianhu replied obediently and turned into the passage inside the portal.

"It's almost time to get to the elevator!" Light and Shadow said as he stalked in the ground.

"Oh! That's amazing! Can any shape be changed? It's a lot of fun! Yuri said enviously as she looked at the half-headed light and shadow on the ground.

"Freedom isn't such a good thing! If you are free to go anywhere, you will have no real place to go! The light and shadow stalked on the ground as if they were backstrokes.

"You just said you're idle............ What does a person do when he or she does it? Qianhu asked.

"Sometimes I write poetry............ "Light and Shadow replied.

"Poetry......? Like what kind of? Qianhu continued to ask.

"Lately, it's been written in binary, which is a bit hard for humans to understand! But occasionally I'll give it to the mechanics! ”

"Is it like haiku or something?" Yuri suddenly snapped out a word and asked.

"It's a little different............ All right! This is it! Light and shadow led the three of them to a large gate and stopped.

"Is this the elevator to the top floor?" Yuri said, looking at the closed door in front of her.

"Wait a minute! I'll open the elevator door now............" The light and shadow operated on the identification light screen next to the door for a while.

"Beep!" With the operation of light and shadow, the elevator door emitted a few electronic sounds, and began to slowly open.

A room of several thousand square meters appeared in front of the three of them.

"Oh! So spacious! Yuri exclaimed excitedly.

"Are you going to start this and take us up?" Chito also said in amazement.

"Yes. But in exchange, I have a request......" Light and Shadow said to the three of them.

“？”

"I want you to be able to operate this terminal." As the light and shadow fell, a cylindrical platform began to emerge from the surface of the elevator.

"Does this terminal do anything?" The boy asked.

"It's nothing! It's just going to give me real freedom! Light and shadow said to him.

“………… All right! The three of them were silent for a while, and finally Qianhu came forward to agree to the request of light and shadow.

"You can get to the top with this elevator! I'll give you the map you need for your destination! Light and shadow got a satisfactory answer and said happily.

"Ahh Thanks, that's great! "Thousand households are grateful.

"It's okay! …… So first of all, please enter these numbers......" said the cursor on the head of the light and shadow turned into a long list of numbers.

“…… Is that so? Qianhu typed the numbers on the light and shadow head into the numeric keypad.

"That's right! That's it! Light and shadow said after confirming.

"And then?" Chiho asked.

"Anyone from all three of you, please keep an eye on this camera." Light and Shadow made an arrow next to a lens.

"What happens if you do that?" Yuri said as she stepped forward and said in the light and shadow.

"I'll disappear............" said Light and Shadow.

"Yu! Stop it! Senhe pulled away Yuri, who was creating, and called out to stop her.

"Beep!"

However, it was still a step late, and with the prompt sound of the certification completed, the purpose of light and shadow was also completed!

"Thank you so much for helping me get my certification!" Light and Shadow said to Yuri.

"Disappear...... What is the meaning? Qianhu asked.

It's literally: to wipe out ...... For living beings, it's death! Light and shadow said.

"Dead ............" Yuri finally understood what she had just done.

"But............ Why die? Qianhu said in a panic.

"Already want to make it all over...... I've spent decades writing code that destroys myself, but the final certification has to be done by humans............" explains Light and Shadow.

"Is this the poetry you wrote?" The boy said suddenly.

“…… That's right! For me it is called the poetry of disillusionment...... Rest assured! After I disappear, the elevator will work............ I've already set it up like this! Light and shadow said.

"That's not what I'm trying to say............ We were chatting together just now, but now we want to ............ it ourselves," Qianhu said in a panic.

“……………… Can you understand what eternity is like that has not been forgotten? Light and Shadow asked.

"What is it that you have forgotten?" Yuri asked.

"It means to forget. The one you're good at! Chiho replied.

"Memories are too much of a hindrance............"

"It should be different from what You said!" Chiho retorted.

"Nope! ………… Roughly one meaning! Light and shadow agreed with Yuri's statement.

"The accumulation of infinite memories and the accumulation of infinite losses...... It will lead all thoughts to insolvability, and it is eternal insomnia! …… I'll be there until the preparation of the city's prep power is exhausted, please! Please let it all end! Light and shadow said.

"Nope! I don't really understand............ "Qianhu wanted to try his best to keep it.

“………… But it's already time. Thank you so much for accepting my request............" Light and Shadow said gratefully.

"But if you do this, won't you let Chiho and Yuri live with the memory of killing others for the rest of their lives?" The boy said suddenly.

"Humans are creatures that can learn to forget, and I think they will forget if they have enough time! All in all, thank you............" said Light and Shadow.

"We often meet people who will be asked to do things!" Yuri said as she looked at the light and shadow with some sadness.

"The traveler who appears in a place that has nothing to do with social interests is like God in itself...... That's why I asked for ...... Would you like to pray...... I'm a failure as a god...... Farewell......" As the light and shadow of the last words began to blur, countless modules continued to escape from her......

"Ukiba-chan! Think of a way! Yuri tugged at the boy's sleeve to reveal the bracelet on the boy's hand.

“………… Discover the upgrade plugin...... Whether or not to choose to upgrade......" The bracelet exposed to the air suddenly made a sound as if it felt something.

"Upgrade plugins? …… Does it say............ Select Upgrade! The boy made a quick decision and instructed the bracelet.

“…… Instruction Acceptance Completed...... Start upgrading...... This upgrade requires 6 standard hours ............"

As this voice ended, countless modules scattered from the light and shadow were absorbed by the bracelet along with the broken light and shadow............