That's right, what Fang Zheng was thinking of was the current leader of the Thousand World Tree Clan in the Type-Moon World - Fiore Fulvegi Yugdomrenia. She was also paralyzed on one side of her body, so she couldn't walk and could only sit in a wheelchair. The only difference between her and Yagami Hayate was that Yagami Hayate was affected by the magic power absorbed by the Night Sky Book, while Fiore was born with this condition.

Most of her magic circuits are concentrated in her legs, which results in the normal physiological functions of her legs being suppressed. Of course, in essence, the two are not much different.

However, the current examination of Hayate Yagami made Fang Zheng think of a good way to treat Fiore's legs.

But now... let's focus on Hayate Yagami first.

"Well... as of now, the problem can be confirmed. The next step is how to treat it..."

"Teacher, didn't you say that there was something wrong with this magic device? Can it be repaired?"

Hearing this, Zhishi asked curiously, and Fangzheng shook his head.

"No, there are too many internal errors in the Night Sky Book, which has exceeded the limit of what can be repaired. Moreover, there are no comments for this broken code... I want to know who wrote this and I must fire him!"

"Then is there no solution?"

Nanoha couldn't help but become worried at this moment, and Fang Zheng shrugged his shoulders in response.

"There are ways... Of course, the best way is to reinstall it."

That’s right, the so-called initialization when in doubt. If there is an error or bug in your operating system, when you go online to look for help, the answer you often get is... "Initialize and reinstall the system."

From a certain perspective, this is indeed the best way to solve all problems.

Of course, the Night Sky Book itself did not have a one-click restore system, but who was Fang Zheng? He was the Time Dragon! Manipulating time was Fang Zheng's forte. As long as Fang Zheng restored the time of the Night Sky Book to before its program kernel was modified, or directly to when it was created, then this problem could naturally be completely solved.

But another problem arises.

"So...what will happen to Vita and the others..."

Hearing Fang Zheng's words, Ji Feng held Vita's hand beside him uneasily, and then asked, while Fang Zheng thought for a moment.

"These guardian knights are self-protection programs from the Night Sky Book. Logically, they themselves will not change. However... their memories may be cleared."

"Why?"

Hearing this, Ji Feng and the others' expressions suddenly became much stiffer. She subconsciously grabbed Vita's hand and looked at Fang Zheng anxiously.

"That is to say... Vita, Signum, Shamal and Zafira... Will they forget the days they spent with me?"

"Yes, that's theoretically true."

This time, Fang Zheng did not hesitate at all and gave an answer quickly.

"this……"

"No, Hayate, you don't have to say any more."

Just when Ji Feng wanted to say something else, Signum stood up first and stopped her from continuing. Then Signum turned around and looked at Vita, Shamar and Zafira. They seemed to understand what Signum meant and nodded at the same time.

So Signum looked at Gale again.

"My Lord, Gale, we are the guardians of the Book of Night Sky. We have witnessed the destruction of its owners time and time again. But we were powerless. Now, this is a chance to correct our mistakes. This book will no longer be regarded as a nightmare and a curse, and our master will be free from that sad fate. For this, we will sacrifice our own lives."

"But...you will forget me, we are no longer friends...I don't want this..."

"Teacher, is there really no way?"

Seeing the two sides crying and hugging each other, Sakura couldn't help but grab Fang Zheng's sleeve and shook him gently, asking. Not only her, but also Nanoha and Fate, they also cast a pleading look at Fang Zheng.

"Yes, teacher, their relationship is so good, it would be too cruel to just forget about it..."

"I can try, but there is no guarantee that I will succeed."

Of course, Fang Zheng is not completely without a solution to this problem. He can separate the "Guardian System" module from the Book of Night Sky, and then use time to trace the other parts back to the initial stage, and then reconnect this part of the module back.

But as Fang Zheng said, he did not guarantee that this would be successful, and it also depended on whether these errors affected the protection system of the Night Sky Book. It was like cancer, if the cancer did not affect the part, then it could be preserved, but if it was the affected part, then it could only be removed.

"Are you ready?"

Fang Zheng took a deep breath and made sure that he was clear-headed before looking at Signum and the others. They looked at each other and nodded.

"Of course, we are ready."

"Signum..."

Looking at Signum and the others in front of him, Ji Feng's eyes were filled with tears, and he looked as if he was about to part with life and death... Well, this look was indeed not a good look, and gave people the feeling as if he had become an executioner.

"Well, let's get started."

Concentrating his mind, Fang Zheng waved his hand, and soon, with his movements, Signum, Vita and others in front of him turned into balls of light, and then returned to the Book of Night Sky. Then, magic circles unfolded one by one, and then Fang Zheng began to search and analyze the system modules of the entire Book of Night Sky.

"This is the core, this is the collection, and this is... which idiot wrote this damn program? Do you know how to write it? If you can't write it, don't write it!"

While searching the program, Fang Zheng cursed. He felt as if he was checking for bugs in a program group... No, it was just like a novice programmer who took the initiative to modify a game engine and thought he was great, but was actually an idiot!

"If this guy were in front of me, I would kill him with one sword."

Fang Zheng complained viciously, then he waved his hand and separated part of the program.

"Okay, let's get started."

As he spoke, Fang Zheng stretched out his hand and placed it on the core program of the Book of Night Sky.

The next moment, the power of time began to operate.

Runes and programs were separated one by one, dissipated, and gradually restored to their original appearance. The entire program of the Night Sky Book also began to be restored at this moment.

This is really simple.

Looking at this scene, Fang Zheng couldn't help but sigh inwardly. He remembered that in the animation, when facing the Night Sky Book, everyone had no good solution at all. It even took Nanoha, Fate and Hayate to break the core of the Night Sky Book, and then teleport it to the outer orbit and be destroyed by the rainbow cannon.

However, here, I only need to use the power of time to turn back.

Sure enough, strength is the guarantee of a Happy END.

While Fang Zheng was daydreaming, the core of the Night Sky Book had been restored to its original state. Then Fang Zheng closed his hands. With his movements, the originally scattered Night Sky Book system modules were reassembled, and Fang Zheng stared at the previously separated protection system. He was somewhat relieved until the system modules were successfully integrated into one.

Then, Fang Zheng loosened his hand and waved it gently, and the Book of Night Sky flew in front of Ji Feng.

"Grab it, activate it, and become its master."

Staring at Ji Feng, Fang Zheng spoke.

"Whether you can complete it next... depends on you."

"...Okay, I understand."

Hearing Fang Zheng's words, Ji Feng nodded vigorously. She stared at the Book of Ye Tian in front of her. After a moment, Ji Feng reached out and placed her hand on the book.

Then, a brilliant magical light suddenly burst out.