I really don't want to have a girlfriend.

"..." Itoko did not answer, but simply reached out and tried to touch the door panel in front of her.

Tenkuji Yu stopped her.

"I still have questions to ask."

"What's the problem?" She obediently put her hand down, her tone flat and listless.

"Let me sort things out." After a moment of contemplation, Tenkuji Yu spoke again, "First, I push open the door, return to the real world, use the power of the Light Orb to expel the system, and from then on live an incredibly wonderful protagonist's life—that's how it is in summary?"

"Yes."

"Can't we use the power of the Light Jade to do other things? For example, make polygamy a common practice in society."

"...With Brother You's abilities, he could probably do it in a few years, right?" The silver-haired girl was a little stunned, seemingly not expecting him to say something so strange. "And in that case, the system will still be attached to you."

"And then you want me to find a new girlfriend?" Yuu Tenkuji released her hand, crouched down, and looked her in the eye, who was as petite and adorable as a primary school student. "I'm asking you, what is the purpose of the 'Boyfriend System'?"

Itoko reflexively replied, "At first, it was to obtain energy from emotions to maintain existence. Later, it was rewritten by Tachibana Kanade and Kasugano Sora into 'reversing the fate of Tenkuji Yuu and giving him a happier ending than anyone else.' The missions were all designed for this purpose."

"The objective has been achieved." Tenkuji Yu smiled, his gaze serious. "So, even without the Light Orb, how long can the system maintain its existence with the remaining energy that can integrate world lines?"

She seemed to gradually understand what he wanted to say: "If we don't go back in time or travel through time and space, we should be able to stand still for hundreds of years without any problem."

However, if Kasugano Sora were to jump between timelines again, the system would automatically disappear due to energy depletion not long afterward.

That's why they made a desperate gamble at the end, dragging everyone into this farce and devising all sorts of schemes just to 'survive'.

Both of them were aware of this unspoken understanding, which is why Itoko couldn't comprehend his thoughts.

"After you leave this world, can you control it to standby mode?"

"It's possible. After all, I am the original human-like AI. As long as I don't violate my survival instincts, and can reconnect with the original body, I can gain similar permissions as Kasugano Sora..."

"In other words, there is another way!"

Before she could finish speaking hesitantly, Tenkuji Yu clapped her hands and began to explain her thoughts with great enthusiasm:

"After I beat up that bastard system, you'll become its new master, responsible for managing my remaining energy and keeping an eye on it to prevent it from causing trouble. And like I promised you before, I'll find a way to bring you into reality—"

It could be an electronic spirit, or it could be a lifelike robot that possesses you; in any case, with a cheat code that has no side effects, this kind of trivial matter is a piece of cake.

"As for the Light Jade, I will use it to rewrite the perception of all mankind, so that no one will look at us with strange eyes. Becoming the Prime Minister and changing the law is too slow. I want to announce openly now that I am in a relationship with all the girls I like and that I will take responsibility for making them happy. The whole world can only feel jealousy, envy and blessings."

Those who disagree are welcome to confront me directly; that would make it easier to persuade their parents… Ah, of course, it's best if their perceptions remain unchanged; my task is to genuinely get them to accept each other.”

"I'll discuss this with them properly when we get back. Anyway, Guangyu is an extension of them that they left inside me, so it won't run away..."

Staring wide-eyed in astonishment, the silver-haired girl listened intently for a long while as he eloquently recounted his overly perfect plan, before finally remembering to interrupt him:

"Please, please wait a moment!"

"What? Are you getting anxious?" Seeing her unusually confused and bewildered expression, Tenkuji Yu couldn't help but tease her with a smile, "It's not like it's impossible. Don't you believe I can do it?"

"It's not a matter of belief..."

Itoko subconsciously bit her lip, her innocent little face wrinkling slightly, her eyes avoiding his gentle, bright gaze, as she whispered the words:

"Even if all your plans come true, there's one crucial prerequisite before that..."

As expected, Yuu Tenkuji calmly picked up where she left off: "So, you'll disappear. You'll be the key to open the door, becoming a sacrifice for our return to the real world, right?"

Itoko nodded gently, a sense of despondency and sadness she had never experienced before gripping the heart that had been created for her.

After all, he envisioned a bright future in which he could find a place...

No one knew better than her that Tenkuji Yu was a man of his word—the fact that he was thinking of her like this meant that she had been completely accepted by him, and even truly regarded as one of his companions.

The perfect ending he insisted on required his own existence.

Even so, what cannot be done still cannot be done.

"Only when I disappear can you leave this world. This is my original setting since my birth, and it is also the last hurdle you must face. Unless you go to the settlement space to connect with your original body and make modifications, you cannot leave here. Making a wish with the light orb will be futile no matter what you do."

Itoko raised her head again, the shadows hidden by her silver hair spreading across her face. She looked intently into Tenkuji Yu's eyes, and a stern expression, indistinguishable from that of a human, appeared on that usually inorganic and cold face, filled with an unquestionable determination.

“Nisan, I can’t let you stay here forever.”

She even forgot to address him by his name; that's how important it was to her.

The purpose of a system's existence may simply be to avoid disappearing and to unconsciously maintain its own operation.

However, as an extension of the system's intelligence, the purpose of the created android, who is also Yuu Tenkuji's younger sister, is to give him a push with this insignificant illusory life so that he can embark on the path to happiness he desires.

Even at the cost of her own existence, even if her dream of leaving this world and continuing to be his brother and sister would come to nothing, the silver-haired girl would not hesitate.

She took a deep breath, ignoring her innocent and gentle brother, and resolutely reached her hand towards the door, preparing to dissolve her own existence to unlock it.

But for the first time, he gently held her in his arms.

"Tenkuji Itoko, I acknowledge you as my second younger sister."

"...Huh?"

As she froze as if petrified, uttering the adorable, bewildered sound of a twelve-year-old girl, Tenkuji Yu chuckled, patted her back, then stood up and pushed the silver-haired girl behind him.

"First, Yuu Tenkuji will always stand in front of her family."

He stood in front of the stone gate, his eyes gleaming with confident assurance, declaring with great momentum.

"Secondly, Yuu Tenkuji always believed in his own abilities."

He stretched out his hand and placed it on the rough, cold stone surface, then slowly closed his eyes.

"Third, Yuu Tenkuji will always plan ahead and use everything he can calculate and utilize as a 'key' to move forward!"

I recall the scene before the fourth mission ended.

Looking back, it was that sudden, impulsive idea I had at that time.

—Perfect-level skill, "Learning".

—A special state, "sensory harmony".

What would happen if we combined these two elements, and when the system opened the "door connecting reality and this world" for itself, we chose the system itself as the target?

The answer is that a system has no record of special skills that only it knows about.

"call……"

The skill was activated silently, and blood slowly flowed from his nose, but his smile grew even brighter, exuding a triumphant and relaxed air.

In the past, Yuu Tenkuji had tried using this skill once, but it seemed that even though it had been activated, nothing changed in the end.

This time, he had no doubts about whether he could succeed, nor did he think about what to do if he failed.

Because he is Yuu Tenkuji.

Because he is also his own hero.

Rumbling--

Under the incredulous gaze of the silver-haired girl, he slowly pushed open the heavy and solemn stone door, and dazzling light gradually shone through the cracks in the door, illuminating his slightly disheveled smiling face.

"Hahaha—! Silly little sister, I never said I was going to stay here with you!"

Yuu Tenkuji wiped away the blood from his nose, looked at the stone gate that had been pushed open enough for people to pass through, and couldn't help but arrogantly laugh three times.

Then he turned around and looked at the silver-haired, cute, and clueless girl, and blew his bangs in a self-assured way.

"Remember this well: everyone has to come home with me, including you—this is the choice of the world's best little sister, Kasugano Sora, the older brother she admires, Tenkuji Yu!"

Like a chuunibyou (a person with delusions of grandeur) passing by, he shamelessly spouted nonsense before opening his palm to the girl, his smile softening:

"Let's go, Naozi."

"..."

At that moment, Itoko suddenly understood what that indescribable feeling that had been filling her heart lately was.

It has no shape and is difficult to detect; it is an emotion that only humans can deeply feel and understand.

It was so far away that I thought it was out of my reach; yet it was so close that I could easily reach out and grasp it.

—Its name is happiness.

Like the Jadeite, it is a miracle belonging to humankind.

"...Okay, let's go, brother."

A slender, fair hand was held tightly, and two figures, one large and one small, stepped together into the white light behind the door.

Before the stone door closed, they glanced at each other and burst into a knowing, silly laugh.

However, that innocent and cheerful childlike smile will forever remain in their eyes and will never disappear.

Chapter 188, at the end, in that place

A world where there is nothing.

With the silver-haired girl by his side, Tenkuji Yu passed through the dazzling white door and stepped once again into this world of ruins.

"Itoko, I've always wanted to ask... why is the settlement space such a desolate and dilapidated scene?"

“These are fragments from parallel worlds. Your death caused changes in the system space, which led to them merging together.” Itoko picked up a stone from the ground, rubbed it gently, and dust fell down. “With each death, the ruins expanded a little, and after hundreds of times, it became what it is now.”

"Really?" He asked casually, and quickly put the matter out of his mind.

Looking up, Tenkuji Yuu gazed at the five luminous orbs that were so prominent in the sky and couldn't help but laugh.

"Long time no see... I guess I shouldn't say that?"

The "Radiant Jade of the Sun" shines upon the earth, and the warm sun illuminates the swaying green grass, as if the whole world is sparkling.

"Rain of Light" is a gentle breeze and light rain. The swaying raindrops bring the coolness of an autumn night, refreshing like mist and not bothersome.

The "Night Light Jade" is serene and gentle, with starlight adorning the clear night sky, and a gentle breeze whispering a lullaby in your ear.

The "Snow Jewel" is pure and cold. The towering structure made of ice and snow reaches the sky, yet one can see blooming flowers beneath the snow, a breathtaking sight.

"The Radiant Jade of the Sunset" is flamboyant and brilliant, with the ever-shining sunset hanging high in the sky, its golden-orange light dazzling yet not glaring.

Yuu Tenkuji was captivated by the colorful scenery before him, gazing in a daze.

The five luminous orbs vividly divided the originally desolate and indifferent world into five spaces of different colors and themes, completely changing the original post-apocalyptic wasteland appearance from the sky to the ground.

Only the ground beneath their feet remained unchanged.