In the game world, everything went smoothly for Fang Zheng. However, in the world of magical girls, Fang Zheng encountered some problems.

"Are these the knights you have imprisoned?"

Looking at Signum, Vita and others on the screen, Fang Zheng asked curiously, and Nanoha nodded.

"Yes, teacher, I have heard about them..."

I don't know if it was a coincidence, but after being defeated by Nanoha, these knights also chose to cooperate. They confessed their origins to Sakura and Nanoha, and the reason why they attacked other magicians. These four knights are the guardian knight system from a magic device called "The Book of Darkness", and can be regarded as existences similar to heroic spirits or guardian beasts.

The current owner of this "Book of Darkness" is a little girl named Yagami Hayate. Due to the relationship with the Book of Darkness, Yagami Hayate's health is very poor and her vitality is very weak. In order to protect their master, these guardian knights tried to attack other magicians and use the "Book of Darkness" to absorb their magic power to extend the life of their master.

To be honest, Nanoha and Sakura didn't know what to do. Although Nanoha and Fate thought about whether to contribute their magic power, Tomoyo stopped them. Because in Tomoyo's opinion, although she didn't know what the "Book of Darkness" was, if it was true that according to what these guardian knights said, their masters' vitality was reduced because they were bound to the Book of Darkness, then it would be better not to act rashly before figuring out the reason for all this.

"Well... Chise handled it very well."

Hearing this, Fang Zheng nodded with satisfaction. This was why he handed over the affairs of this world to Zhise. Although Zhise herself was not a magician and was not very familiar with magic devices, she was able to make decisions very steadily and not be as impulsive as other girls.

"What are the results of Preshia's investigation?"

"They refused to give us the Book of Darkness."

Sakura also shook her head helplessly. Several days had passed since they defeated these inexplicable attackers. The other party did not try to escape, but they also refused to cooperate. Apart from reluctantly explaining to them the reasons for the attack, these people refused to cooperate with them in anything.

"You did a great job, let me do the rest."

Hearing this, Fang Zheng quickly gave an answer.

At this moment, in the bedroom, Vita was hugging the Book of Darkness tightly, huddled in the corner without saying a word.

Three days have passed. Logically, they should have returned to their masters long ago, but now, they are locked up here...

“Da…da…”

At this moment, Vita's ears suddenly moved, and he keenly caught the footsteps coming from outside the door.

The footsteps were unusually steady, not like those of the little girls before. Could it be that... the people behind them finally appeared?

“Squeak…”

Just as Vita was thinking of this, the door opened, and then Vita saw a young man standing at the door, looking at her.

"Who are you?!"

For some reason, the moment she saw the young man, Vita felt her hair stand on end, as if she was being stared at by some unknown terrifying beast. She subconsciously jumped up and stretched out her hand to grab her magic device, but it was empty. Only then did Vita remember that her magic device had been confiscated.

"All of you, come to the hall."

Fang Zheng glanced at Vita, then gave him an order, and then he turned and left. Vita was stunned for a moment as he watched Fang Zheng leave, and then he hurried out of the bedroom.

When the four knights came to the hall again, Fang Zheng was already sitting there waiting for their arrival.

"I've heard about your situation from Sakura, Nanoha and the others."

Looking at the four knights in front of him, Fang Zheng spoke first.

"But I want to make it clear in advance that no matter what your reasons are, attacking other magicians and stealing their magic power is absolutely unacceptable."

"Then tell me what we should do!"

Hearing Fang Zheng's words, Vita clenched his fists and roared.

"Do you want us to watch our master die?"

"Your master's experience is worthy of sympathy, but it is not a legitimate reason for you to attack others."

"We just want to borrow some of their magic, sir."

At this time, Shamar also spoke.

"This won't cause any harm to them..."

However, in response to Shamar's rebuttal, Fang Zheng glanced at her.

"I robbed you of your money and told you that you would earn more in the future, so it's nothing. Are you willing to accept it?"

"this……"

Hearing this, Xia Ma was speechless.

"So, what do you want from us?"

At this time, Signum finally spoke. She stared at Fang Zheng seriously and asked.

"Before that, I need to introduce myself to you."

As he spoke, Fang Zheng stood up.

"My name is Fang Zheng, and I am the supreme ruler of Tiandao Palace. The purpose of Tiandao Palace is to protect the earth and human civilization. For us, maintaining the safety and existence of the earth in any plane is the most important thing. This place is not under the management of the Space-Time Administration, so you don't have to worry about being captured by the Space-Time Administration. And although your attack is not worthy of praise, considering that you were defeated and hit by Nanoha, I may be able to help you."

As he spoke, Fang Zheng extended his hand to Vita.

"But before that, I need to conduct a comprehensive inspection of this magic device."

“…”

After hearing Fang Zheng's words, the four knights looked at each other, and finally Signum looked at Fang Zheng again and asked.

"Okay, but you must promise not to damage the Book of Darkness. Otherwise, we will not let you succeed even at the cost of our lives!"

"You have to understand that you are only captives at the moment... Well, for now, I'm just watching."

"...I understand. Vita, give him the Book of Darkness."

"OK."

After hearing Signum's order, Vita walked up to Fang Zheng in a rather unhappy manner and handed him the Book of Darkness. Fang Zheng reached out and took the Book of Darkness, and then started flipping through it.

"it's useless."

Seeing this scene, Vita sneered.

"Unless you are the true owner of the Dark Book, you will never be able to obtain the system management authority of the Dark Book..."

However, before Vita could finish her words, Fang Zheng stretched out his finger and lightly touched the cover of the Book of Darkness.

“——!!”

The next moment, countless magic circles condensed by purple light beams spread out with the Book of Darkness as the center!

Upon seeing this scene, the four guardian knights widened their eyes at the same time. As the guardian programs of the Book of Darkness, they certainly understood what this meant!

The Dark Book's protection program has been breached! ?

"I see……"

Looking at the magic program and the runes displayed in front of him, Fang Zheng frowned, then looked at Preshia next to him.

"Precia, what do you think?"

"Well... I think the problem should be obvious."

Preshia nodded as she analyzed the rune structure in front of her. After hearing the conversation between the two, Nanoha couldn't help but ask out of curiosity.

"Teacher, is there any problem?"

"certainly."

Hearing Nanoha's question, Fang Zheng nodded, then he enlarged a part of the Dark Book program and reached out to click it.

"In theory, the original Book of Darkness... oh, according to the name in this program, it should be called the Book of Night Sky. It was originally an absorption program created to collect and study magic techniques from various worlds. You can think of it as a simple, portable library to record all kinds of magic information and spells. However... because of some idiot, the core program of this magic device was destroyed."

"destroy?"

Hearing this, Vita couldn't help but ask curiously, and Fang Zheng nodded.

"That's right, I don't know which idiot it is... Look, okay, you can't understand it either, it doesn't matter, I'm the same. According to the program, the original Night Sky Book was completely absorbed manually, which means that the magician holding this magic device needs to actively drive the Night Sky Book to absorb and record the magic program. Of course, originally speaking, this is harmless..."

"But there is clearly something wrong with our master's body!"

Hearing this, Signum couldn't help himself, and Fang Zheng waved his hand.

"Listen to me. What I'm saying is that the original version of the Night Sky Book itself had no design problems. But the problem was that later... I don't know how many owners this magic device has passed through, but there must have been a fool who felt that it was too tiring to absorb it by himself every time, so he rewrote the program of the Night Sky Book... He added a self-search and self-maintenance system to the Night Sky Book. Of course, from the current point of view, the original intention of this magician may be to allow the Night Sky Book to automatically complete some tasks that had to be done manually before, but there was a bug in his program compilation, which caused the system operation of the Night Sky Book to produce an infinite loop..."

Having said that, Fang Zheng reached out his hand again and opened the core system.

"This magician overlooked a problem. That is, if the Book of Night Sky needs to operate on its own, it needs enough magic power to act on its own. This idiot obviously did not solve this problem, so the Book of Night Sky had to absorb the magic power of others to maintain the operation of commands. I think the next few owners probably didn't have an easy time... because even if they didn't use the Book of Night Sky, it would absorb their and external magic power in order to execute self-search and collection commands..."

"Then, as long as we complete the collection of the Night Sky Book..."

"it's useless."

However, Fang Zheng interrupted Vita's speech again.

"I said before, that idiot didn't think of the magic absorption problem when designing the Night Sky Book, so this caused the program command to fall into an endless dead loop. Even if all the pages of the book are collected, it will still enter the action of self-searching and absorbing magic power without restraint. In the end... it might end up self-destructing."

“What shall I do?”

Hearing this, everyone's face changed drastically, and Vita couldn't help but shout.

"Don't you have any way to solve this problem?"

"Um……"

After hearing Vita's question, Fang Zheng thought for a moment and then gave an answer.

"I need to see the master's situation before making any plans."