I really don't want to have a girlfriend.

She spoke softly.

That tone was familiar.

……

"By the way, what about Aya? She's still in the bathroom..."

"Don't worry, I did something a little trick to make her constipated inside until the start of her reincarnation, then there won't be any problems."

"???"

"Just kidding, I already hinted that she should go home alone first... Sigh, even if it's not the same person, seeing my brother being taken away by another girl and having her all to myself for so long still makes me feel really upset. That's why, in the end, I in that world..."

"Qiong (Unit 2)?"

"It's nothing, don't worry about it... By the way, what's with the word in parentheses?"

The door to the science classroom closed.

An empty corridor, a lonely and chilly afternoon.

It seemed like only a moment had passed before the hustle and bustle of graduation season returned to the campus, a clear and bright spring afternoon filled with the scent of pollen.

The vast, boundless azure sky enveloped the entire Soubu High School like a hemisphere.

On the rooftop.

With her snow-white hair fluttering in the wind, the slender girl stood by the railing, gazing at the crowd below moving about like ants, listening to the laughter and cries that could still be clearly heard even from such a height.

This is parting.

Some people are saddened by this, while others are happy because of it.

She only wanted to see other people's happy smiles, especially the most important people—even if she herself was sad or upset, it didn't matter; their smiles were more important than anything else.

Even if I were to become a ghost, I could only silently watch over them.

Therefore, there was no regret, nor any further desire.

With a serene smile on her face, the girl's figure vanished with the wind.

Silence was swept away by the sandstorm, and the rooftop, with its iron gates firmly locked, was also deserted.

Chapter Sixty-Four: The Beginning of the Story

Contrary to what Yuu Tenkuji had imagined, the interior of the science classroom remained unchanged.

"Alright, alright, class is about to start. Everyone, please sit down quickly."

While pretending to be serious, Kasugano Sora walked into the classroom with a brisk pace, took out her wand and waved it twice. All the desks and chairs were pushed back to the back of the classroom, leaving only one chair facing the blackboard.

She walked to the front of the classroom, snapped her fingers with a flourish, and the projection screen slowly fell down, the lights dimmed, making it look like she was about to start showing a slideshow for teaching.

After doing all this, Kasugano Sora nodded in satisfaction.

"You seem to be having a lot of fun..." Yuu Tenkuji muttered speechlessly from behind.

Ignoring his words, the silver-haired woman stroked her chin and fell into deep thought: "Hmm... there's still an hour and a half before the cycle of reincarnation begins, that should be enough time for me to explain the whole story, right?"

"Even a novel with several thousand words could be explained in an hour and a half, right?"

Could the stories of the past be that extensive?

Filled with doubt and curiosity, Yuu Tenkuji consciously sat down in that chair, facing the 'older sister' in a white coat.

"Even if you can't finish today, you should be able to finish when the next cycle begins, right? Or will you, as the administrator, lose your memory because of the cycle?"

“No, not at all…” Kasugano Sora hesitated for a moment, as if she had something difficult to say, but quickly and decisively gave up on explaining.

"Well, I'll try to keep it short."

With her hands in the pockets of her white coat, Kasugano Sora sighed deeply, her face downcast: "Actually, I originally planned to reveal the truth to you only after everything was over... Unfortunately, too many unexpected things happened this time, causing my plan to completely collapse like a piece of waste paper. Now I can only take it one step at a time."

She raised her eyes, her gaze both helpless and tender as she looked at her 'brother' in front of her, like seeing cherry blossoms that had not yet faded in summer, yet filled with inexplicable hope.

"There's nothing I can do. Yu is the kind of troublesome person who can't take any action without clarifying the current situation. Since things have come to this, I can only tell you the whole story in advance and then let you complete the trial."

Tenkuji Yu met her gaze directly, his expression calm and composed, his lips slightly pursed, indicating that she could begin to speak.

"So……"

Kasugano Sora exhaled softly, then took out her wand from her sleeve, pointed it at the blank projection screen, and uttered a short shout:

"Memory manifests!"

Familiar snowflakes suddenly appeared, and the image gradually became clear as it shook.

Tenkuji Yu looked at her with a puzzled expression: "Is this spell in Harry Potter?"

"No, I don't think so." Kasugano Sora remained expressionless, her pale eyes narrowing slightly. "It's just that chanting a spell makes it sound more imposing. Do you have a problem with that?"

"No, of course not."

"Humph~"

That snort, slightly disgruntled yet inexplicably smug, was as adorable as a cat that had caused trouble and then rightfully allowed its owner to scratch its chin.

Even though it wasn't the same person, Yuu Tenkuji confirmed it in his heart once again—no matter which world Kasugano Sora was, she was indeed the little sister he knew and loved.

"Hmm, let me confirm this before we officially begin."

The wand tapped against her slender, fair hand. The silver-haired woman had somehow put on thin-rimmed glasses, exuding an intellectual and mature aura like a young female teacher.

"Yu, would you like to start by understanding from the very beginning, or would you like to hear about my own experience first?"

Sky Temple Yuu frowned slightly.

"Is there a difference between these two?"

"Of course."

She smiled slightly, as if casually talking about what game she had played that day, and said, "I only went through dozens of timelines to get here, and the origin of everything... according to Kanade, was probably hundreds of timelines ago?"

"..."

For a moment, Yuu Tenkuji was speechless, staring at her in astonishment.

After a long silence, he asked again in an incredulous tone, "Hundreds of world lines?"

Not a few days, not a few years... but hundreds of world lines?

Is there something wrong with her time unit?

"Don't doubt it, it's the world line."

Kasugano Sora shrugged and spread her hands, not surprised by his reaction.

"However, when it's my turn, I will be awakened on a certain day when you are seventeen, and then I will be moved to the next timeline to continue my efforts in less than three years, so the overall time spent is not long."

So you are currently 16+3X years old?

Setting aside the thought of delving into the doubts and suppressing the instinct to recklessly criticize the previous sentence, Tenkuji Yu unconsciously pressed her thumb to her brow, seemingly with a headache, and said:

"Then why would the Kanade you mentioned... who is Tachibana Kanade, right? know about this kind of thing..."

He had a vague idea of ​​the reason, but felt it was unlikely and subconsciously denied it.

If that's really the case, considering Kasugano Sora's experience, Tachibana Kanade...

Doesn't that equate to experiencing hundreds of years?

"Because she was the person involved."

However, the next moment, the younger sister from another world casually confirmed this cruel fact in an overly relaxed tone.

"Besides what I've experienced, everything that happened to you in every timeline, everything she witnessed hundreds of times... was told to me by Tachibana Kanade herself."

"Even though you don't remember her, the origin of all the stories so far has been the meeting between the two of you."

Ignoring the dazed look on Tenkuji Yu's face, Kasugano Sora looked at the projection screen. The messy snowflakes had disappeared, replaced by a documentary-like video.

Because the system has an automatic recording function, the footage was shot from a third-person perspective—this was a function that Tachibana Kanade had told her about, as she had used these videos to help explain the situation when she was telling her the whole story.

After all, watching a movie is always more memorable and impactful than listening to an audiobook, and it also saves the trouble of starting from the beginning.

"Look closely, Yu."

"That is the very beginning of the first world line, the origin of everything, and also the reason why we persevere without regret, no matter how many world lines we have to cross, no matter how long we drift in the river of time, we will change our destiny for you—"

"The beginning of the story."

.........

……

...

summer.

It was a very ordinary afternoon.

An ordinary boy encounters an extraordinary system, thus beginning an extraordinary life.

The boy's name is Tenkuji Yu.

The system is called "Girlfriend Development System".

He knew what he should do, he was familiar with all the routines, and everything was ready except for the final push.

That's right, Yuu Tenkuji still needs a girlfriend.

Chapter Sixty-Five: Standing Amidst the Vanity of the World, Playing the Melodies of Nature

School cafeteria.

The two met for the first time in front of the cafeteria's meal ticket machine.

The silver-haired girl was disappointed because the Mapo Tofu was sold out. He, who happened to be passing by, kindly took the last Mapo Tofu and traded it with her for curry pork chop rice.

So from that day on, they simply got to know each other, and simply became more and more familiar with each other, and their feelings for each other grew stronger.

She always kept to herself, aloof like an angel on earth, never getting too close to mortals.

He always seemed out of place, distant like someone from another world, subconsciously keeping his distance from others.