One-way traffic

The outside world suddenly became noisy.

"...The one sitting at the very back, is that...Accelerator?"

We're doomed. That was the immediate thought of everyone around.

"Since you're a transfer student, I won't let you answer any overly difficult questions in today's first class... However, everything we've covered so far is content that I've explained countless times today. Anyone who's been here and listened to the lecture will definitely be able to answer these questions."

The teacher's voice also began to sound somewhat heavy.

The students watching immediately began to pray for him secretly.

"I hope you can come up and answer my questions properly, okay?"

"...What is this?"

Accelerator, who had just woken up, glanced casually at the blackboard, but his expression quickly returned to one of drowsiness.

That was really nothing that could get him worked up.

"Hey! What's with that expression? Is what I said really that offensive?!"

"Oh no, oh no—!"

Everyone wore expressions of disapproval, and the teacher's voice became authoritative.

Accelerator casually walked to the front of the stage.

He felt neither dissatisfaction nor disdain, because he knew very well that this was something a normal high school student should experience.

However, he wasn't among them.

"Huh…?"

"He's starting to answer...wait, what?!"

Just as the teacher had thought, Accelerator did indeed begin to provide the answer.

He didn't intend to make things difficult for the other student, after all, she was just a transfer student. Anyway, after she wrote it down, he would just say a few words to her to make sure she didn't sleep in class anymore. Everyone understands this kind of thing, and everyone gives each other a way out.

But the situation is completely different now.

In just over ten seconds, the entire blackboard was almost completely covered with countless formulas and data.

That was clearly just a regular high school question.

But if I'm not mistaken—

"What, what is this?!"

"Calling it the theory of relativity is too simplistic. In reality, it differentiates between microscopic and macroscopic structures, and then uses equivalent methods to calculate the fundamental data, just like calculating the moment of the Big Bang in advance. Although the hypothetical data will eventually deviate from the actual results, it is just a question. The answer is fixed and it is far from that point."

The math teacher's eyes were completely at a loss for where to look.

"Tsk, this kind of godforsaken place doesn't need the theory and data of personal reality and AIM diffusion field. To put it bluntly, it's just an ordinary high school. But even so, this level of knowledge is nowhere near the level of junior high school students in Academy City... It's not even that interesting to watch as a joke."

Ding--

At the same moment, the bell rang to signal the end of get out of class.

"Old, teacher..."

"oh…"

After blinking several times, the math teacher finally returned to the podium.

"Well then, everyone, that's all for today's class... Class dismissed..."

"As for today... there won't be any homework for now, because... I haven't decided yet... what kind of homework to assign..."

The math teacher remained in shock until he left, and everyone in the classroom shared the same utter astonishment.

"Really?! Is this for real?!"

Shido Itsuka, sitting in the chair, almost popped his eyes out.

"What is that guy writing?! It's all numbers, but the way they're put together is completely incomprehensible! Is that even something a human could write?!"

"Hey Accelerator! Which school did you go to before?!"

"You weren't the top student in your school before, were you?"

"Wow, that's amazing! I think these formulas were mentioned in one of Einstein's papers, right? I never imagined they could be used in this kind of situation!"

"No, no, what I'm more concerned about is how a high school student knows such terrifying knowledge!"

No matter how noisy the people around him were, Accelerator paid them no heed.

However, soon someone walked out from the crowd and stood in front of him.

"You were really amazing just now... but you seem to have completely terrified that teacher."

Hatsune Miku walked directly into the crowd and started talking to Accelerator, while the people around her fell silent.

Accelerator clicked his tongue in obvious displeasure.

"It's just an ordinary university, you bastards."

"It seems... like you don't really like it?"

"More than that, it's absolutely boring."

This really is a pointless thing.

It's like sending a special forces soldier who's been on the battlefield for years to a kindergarten to watch kids fight—it just feels so jarring.

Even in the talent-rich Academy City, Accelerator possesses an ultimate brain that stands above 2.3 million people, with such intelligence that he can even reverse-engineer data about the human brain's neural pathways. Yet, he was dragged into an ordinary high school to do math problems.

Even Accelerator himself found this unfunny joke boring, but since it was for the sake of observing Itsuka Shido, whom the system was focused on, he couldn't say anything more.

The first person, ignoring all other trivial thoughts, immediately opened the classroom door.

"I even made a bento box! Want to come and eat together later?"

"That's fine... You really have a lot of free time."

The first person to leave behind his last words simply left the classroom.

Hatsune Miku watched Accelerator leave, and thinking about the school life she would continue to experience with him, she couldn't help but smile with anticipation and excitement.

This scene caused an uproar among everyone.

"Hatsune Miku."

A female classmate, whose origins are unknown, asked her this question tentatively.

"Um, what exactly is your relationship with that Accelerator classmate...?"

Facing a group of students with puzzled expressions, Hatsune Miku simply touched the corner of her mouth with her hand.

"It's a secret!"

——————————————————————————————————————————

It's just so boring staying at school.

As Accelerator walked down the stairs to the first floor, he thought to himself that even if he was expelled, it wouldn't matter to him. After all, he had many ways to observe Itsuka Shido, and this method was just the most convenient.

After enduring a whole morning, even he found it incredibly boring.

I might as well skip the afternoon.

With that thought in mind, Accelerator had already arrived in front of a door.

"...This feeling."

However, coming here is not something you can just do randomly.

I've had a strong sense of déjà vu about this school since before.

Yes, behind this door.

He looked up in the direction of the door number.

The sign above reads 'Physical Preparation Room'.

Why do I have these unusual sensations in this place?

But there's no need to overthink it.

Accelerator shook his head, but ultimately placed his hand on the doorknob.

Click.

However, the content inside was not quite what I expected.

Upon opening the door, a completely dark room came into view.

"…ah?"

Looking at the pitch-black room, with even the curtains completely drawn, even Accelerator couldn't help but be stunned.

However, what appeared in front of him was not anything unusual.

Instead, it was a figure that had already been seen on that spaceship.

A silver-haired woman wearing a white lab coat with a teddy bear tucked into her breast pocket.

"…Um?"

She seemed somewhat surprised, astonished that anyone would come here.

The two looked at each other.

"This place should be off-limits during holidays."

"That kind of thing isn't the point anymore."

The other person just watched him silently.

"On the contrary, why would you, the guy from that spaceship, end up in a place like this?"

"As you can see, I am now employed at this school... and I am also one of the teachers at this school."

"By the way, I'm also the assistant homeroom teacher in your class. Actually, I went to your class this morning... but that was during the first period, and you haven't arrived at school yet, so it's normal that you don't know."

It's that woman named Murasame Reine.

Regardless, once he saw that it was someone he knew, Accelerator stopped worrying about his previous feelings.

Perhaps it really is just an illusion.

"So, what exactly are you doing here?"

"To be your assistant class teacher."

"Stop making those boring, nonsensical jokes."

"It's nothing, it's just a fact."

Murasame Reine continued explaining as she brushed her long silver hair aside with her hand.

“That was indeed my identity while you were in school… Yes, only while you were in school.”

"After you all finish school, I will call Xiao Shi here for special training."

"Special training?"

Upon hearing this unusual term, Accelerator couldn't help but become interested.

Simultaneously.

"Haha... Sorry I'm late... Huh?"

The person who had just arrived looked completely bewildered upon seeing the scene inside the room.

Shido Itsuka glanced at Accelerator, then at Reine Murasame.

"...Am I... a little too early...?"

"No, it's just the right time."

"But, but, there are other people here right now, do we really have to do special training at a time like this...?"

Shido Itsuka waved his hand hesitantly, but was immediately pulled into the room by Accelerator.

Bang! The other party slammed the door shut without any mercy, startling Itsuka Shido.

"Interesting. What do you mean by 'special training'? Do you mean to give this guy tactical coaching?"