Roaming through the world of Doraemon

"Click~"

The desk in front of Ye Tiancheng opened slowly, just like before, and Doraemon and a boy wearing a bodysuit jumped out of the drawer.

"Nobita, everything I said came true, didn't it?" Doraemon asked happily, sticking his head closer to Ye Tiancheng.

Although the plot is different from the original, the development of events is exactly as Doraemon predicted, and the changes in the timeline have actually made things even more intense.

"Grandpa, my name is Nobi Sewashi. I am the grandson of your grandson. I brought Doraemon from the 22nd century to save you from your unfortunate fate. You know, because of the debts left by your failed business, our family will not be able to pay them off even in a hundred years, and my New Year's money this year is only fifty yen."

Sewashi, with Doraemon by his side, casually found a cushion, knelt on the plate, and complained with a pained expression about this year's New Year's money.

"I'm so sorry for causing you so much trouble. I will definitely try my best to change and hope it will bring about a change in your lives."

Ye Tiancheng looked at Seshu and Doraemon, who were kneeling beside him with pained expressions, and solemnly assured them.

"Grandpa, we came here to change your life, but for some reason, the photo album we were going to show you suddenly stopped displaying images. We went back to the future to check it, and found that there was nothing wrong with the album!"

As Seshu spoke, he reached into Doraemon's four-dimensional pocket, took out a thick photo album, and placed it in front of Ye Tiancheng.

Ye Tiancheng opened the time album that Shi Xiu had sent. The first page of the album clearly showed Nobita's name. Each page inside was composed of several small screens with specific times displayed. However, for some reason, the images of the times before Doraemon arrived were there, but after he arrived, the small screens above the times were now just static and nothing could be seen.

If I remember correctly, the album should later show images of Nobita failing his college entrance exams, losing his job, starting his own company, having it burned down, and being chased by creditors. But now there are none of them. Flipping through a few more pages, I find only snowflakes.

"Seshu, why can't I see my future after Doraemon came to this room?" Ye Tiancheng closed the time album and handed it back to Seshu, saying awkwardly.

Shi Xiu picked up the time album that Ye Tiancheng had looked through and found that it was still blank. Even though his great-grandfather had looked at it, the time album still hadn't been corrected.

"Perhaps, your future, Great-Grandpa, changed drastically when Doraemon came to this room, and the time album can no longer track it."

Originally, Sewashi had planned to use the time album to make his great-grandfather reflect on his actions, but now, because of Doraemon's arrival, his great-grandfather's timeline has become blurred and can no longer be seen. Hopefully, even without this reflection, his great-grandfather will have gained some insight and made changes.

"But if I make a change, will you still be able to be born, Shi Xiu?" Ye Tiancheng asked tentatively.

“Even if you change history, we will still be born. For example, if you want to go to Osaka today, there are many means of transportation and routes. But no matter which one you choose, as long as you are heading in the right direction, you will eventually reach Osaka. We and Doraemon are like the destination of the journey. No matter how you change things, Great-Grandpa, we will still exist in this world.” Sewashi replied, casually fiddling with the time album.

Before Sewashi could finish speaking, Doraemon stood up, patted his chest, squinted his eyes, and said loudly, "I, Doraemon, will always follow you and take care of you!"

Ye Tiancheng looked Doraemon up and down, who was full of fighting spirit and making bold statements. It seemed that Doraemon had not yet become familiar with Nobita at this time, otherwise he would not have used the word "you" (formal). Perhaps after becoming familiar with Nobita, the two would have formed a bond and become inseparable.

"Sigh, I was hoping to explore this 20th-century city, but I was delayed by the time album. I'll have to come back another time." Sexiu jumped onto the table and looked out at the city through the glass, a look of curiosity on his face.

"If you don't hurry back, Mom will start nagging again. I'll take you back." Doraemon said, lifting Sewashi off the table, and the two of them jumped into the time machine.

After watching the two leave, Ye Tiancheng couldn't help but smile with delight, because he already knew the truth through Shi Xiu's time album.

Actually, my future has already changed...

PS: I haven't said this yet, in case some readers don't understand. The world line and timeline here are actually the original plot and timeline.

Chapter Four: Nobita the Academic Pro

Before he knew it, Ye Tiancheng's short winter vacation was over in the middle of January, and it was time to go back to school.

It has to be said that Japanese elementary school students have a lot of holidays. Every day around New Year's Day, according to the Japanese lunar calendar, is the New Year, which is a winter break of more than ten days. Then there is a spring break in early spring. No wonder Nobita and his friends had plenty of time to go on adventures in the original work. With so much time, they could do whatever they wanted.

"Nobita, get up quickly! We have to go to school today!"

With a click, Doraemon jumped out of Nobita's closet and ran to Ye Tiancheng to help him prepare the stationery he needed for school.

Looking at the flustered Doraemon in front of him, Ye Tiancheng thought that his dorayaki offensive was finally having some effect. Ever since Seshu left Doraemon here, Ye Tiancheng had been buying Doraemon dorayaki in various ways every day. He had basically scoured all the dorayaki shops in the city. He guessed that Doraemon had eaten all the dorayaki he could eat in his lifetime in the past few days.

Originally, I was worried that Doraemon, such a highly intelligent robot, might cause social unrest. If a group of people stormed Nobita's house and dismantled Doraemon, things would get really bad. But this is what Doraemon, who was munching on a dorayaki, said to Ye Tiancheng.

"As an excellent childcare robot, I installed a transmitter that emits signals all the time and in all places before coming here. Everyone in this world who sees me will think that I am a normal and reasonable existence and will not cause any disturbance."

No wonder Nobita could take Doraemon's gadgets and cause all sorts of trouble in the original story. Without such original gadgets, Nobita would probably have been taken away and dissected.

Ye Tiancheng leisurely left the house with his schoolbag on his back. Along the way, he carefully observed Japan in the 1980s. Although Tokyo was not as developed as it would be in the future, the vehicles shuttling on the road already showed the beginnings of a modern city. It seemed that life in the future would not be boring.

Nobita's school is located in a remote back mountain area in this newly developed urban area. Getting to the school requires going through countless alleys every day. Fortunately, Ye Tiancheng had merged with Nobita's memories and gone out for a walk while he was at home these past few days. Otherwise, he would have been late for school on the first day.

The walk to school took about thirty minutes, with frequent stops and starts. Looking at his watch, it was almost eight o'clock, so Ye Tiancheng quickened his pace and hurried towards the school.

Just as the clock on the school's clock tower pointed to eight o'clock, Ye Tiancheng walked into the classroom and put down his schoolbag. At that moment, a middle-aged man with a serious expression walked in.

"Today was great! It was the first day of school and everyone was on time, especially Nobita Nobi. He deserves praise."

Wearing thick glasses, I, Cheng Rongyilang, glanced at Ye Tiancheng's seat and said happily.

"Alright, now that everyone is here, let's begin the lesson. Today we'll be learning from the fourth-grade math textbook."

I, Cheng Rongyilang, stood on the podium, opened my textbook, grabbed the pointer, and immediately began teaching, entering a state of lecturing.

But before I could finish speaking, I, Eiichiro, discovered that Nobita Nobi, whom I had just praised, had fallen asleep on the desk in front of the teacher's podium right in front of me.

"Nobita, Nobita, how come you fell asleep on the first day of school? Did you even learn everything we taught today?!"

Ye Tiancheng looked at Cheng Rongyilang, who was in the middle of a rage, and felt speechless.

Nobita, that good-for-nothing, hadn't done a single one of the winter break assignments before I arrived. Luckily, I found out early and stayed up all night to finish them. Otherwise, given my personality, Ye Tiancheng would have to attend all his classes outside the classroom this semester.

Ye Tiancheng slowly opened his eyes and saw Cheng Rongyilang standing menacingly in front of Da Xiong, holding a pointer and looking like he was about to explode.

"Nobi, did you learn anything in today's lesson? You were sleeping in class. I bet your parents will be coming to school to talk to me about your daily routine on the first day of school." I, Cheng Rongyilang, asked angrily as Ye Tiancheng suddenly woke up.

I thought Nobita's behavior would improve in the new semester, but he's still the same as before. If we don't teach him properly, how can we face the parents who sent him to school?

Ye Tiancheng looked up at Cheng Rongyilang, then immediately turned his head to look towards the blackboard.

"Addition and subtraction operations and systems of equations?"

The classroom blackboard was divided into two sections, both densely covered with piles of math problems. In front of one of the blackboards, Dekisugi was frowning as he struggled with a system of equations.

The problem in front of me could probably be solved by a second-grade elementary school student in China, let alone an adult who has gone through university. Solving such a problem is really child's play for me.

"Teacher, let me calculate it."

Before Ye Tiancheng could finish speaking, he rolled up his sleeves, picked up the chalk from the podium, and started writing on the blackboard, explaining the verification methods and formulas to the teacher as he wrote.

"This question is a simple hypothetical proposition. If you extract the question stem beforehand, you'll find that it's actually just an addition problem. The key to solving this system of equations lies in whether you can extract the question stem..."

Not only that, Ye Tiancheng, who was writing and explaining at the same time, also connected addition and subtraction operations with systems of equations, and solved the problems on the blackboard two or three times in different ways before putting down his chalk.

Looking at the dense formulas and operational rules written by Ye Tiancheng on the blackboard, I, Cheng Rongyilang, was quite astonished. Not only that, every student in the classroom stared wide-eyed at Ye Tiancheng's storm-like solutions and calculations.

Ye Tiancheng put down the chalk and looked at Dekisugi beside him. He realized that Dekisugi had only written most of the questions on the blackboard. Ye Tiancheng felt no sense of accomplishment at all for using his adult intelligence to bully Dekisugi, a primary school student.

"How is this possible? Nobita actually finished writing it all!"

After about a minute or two, Dekisugi finally finished writing the last question on the blackboard. After finishing, Dekisugi looked around and thought that Nobita was still struggling with the question. However, he found that Ye Tiancheng had actually finished writing all the questions on the blackboard and was solving them in various ways. Dekisugi was so choked up that he couldn't speak for a moment.

"Okay, Nobita and Dekisugi, you two should go back to your seats first..."

Chapter 5 County/District Math Competition (Please add to your favorites)

"How is this possible..."

Although I, Cheng Rongyilang, pretended to be calm and let Ye Tiancheng and Dekisugi return to their seats, my heart was churning with turbulent emotions as I looked at the densely written problem-solving formulas and strategies on the blackboard.

As Nobita's homeroom teacher and math teacher from first to fourth grade, I, Eiichiro Naruto, know Nobita's academic performance better than anyone else over the years. Apart from frequently getting zero marks in the math class I taught, Nobita's scores in other subjects fluctuated between single and double digits.

Ye Tiancheng's ingenious problem-solving trick today completely shattered my worldview. Could it be that Nobita, who always drags down the class average, has finally figured it out after a winter break?

"Nobita, where did you learn your problem-solving strategies and methods from?"

I, Cheng Rongyi, stared intently at the student in front of me, who was beyond my expectations, and asked carefully.

"Teacher, during the winter break, my cousin, a graduate of the University of Tokyo, came to visit. During his free time, he explained all the fourth-grade curriculum to me. Not only that, he also showed me the fifth and sixth-grade textbooks. The formulas and thought processes that I wrote on the blackboard were all taught to me by my cousin."

Looking at Cheng Rongyilang's deep gaze, Ye Tiancheng couldn't help but fabricate a non-existent cousin. Otherwise, anyone would doubt that he had become a genius who surpassed Dekisugi after just one winter vacation.

"Oh, so Nobita has been taking fifth-grade courses with this cousin? In that case, the teacher is even more eager to see how you're doing with your cousin!"

I, Cheng Rongyilang, watched as Nobita, with a sincere expression, walked towards the blackboard with a smile, and without saying a word, buried his head in the blackboard and wrote a few more questions.

This guy, Cheng Rongyi, is really a pain. He told me the test was for fifth graders, but he used Olympic-level questions. These questions would be impossible for anyone, not just fifth graders, but even middle schoolers. I really don't know what Cheng Rongyi was thinking. Did his worldview collapse because he suddenly stood out?

Ye Tiancheng glanced at the question, paused for a moment, then immediately picked up the chalk on the lectern and once again demonstrated the fancy problem-solving method he had just used.

In less than five minutes, Ye Tiancheng quickly wrote out the answers to the questions one by one, breaking them down, extracting, combining, and calculating.

Staring at the blackboard full of formulas, I, Cheng Rongyilang, widened my eyes and was speechless for a moment. All I could feel was astonishment.

"How was it, teacher? Was my calculation correct?"

After putting down the chalk and roughly checking the answers, Ye Tiancheng turned to Cheng Rongyilang and asked.

"Yes, not a single one is wrong. Your teacher is so proud of you!" After checking Ye Tiancheng's calculations, I, Cheng Rongyilang, couldn't stop smiling. He stared at Ye Tiancheng with an admiring expression.

To my surprise, Nobita Nobi really changed over the winter break. Not only did his math scores improve dramatically, but his overall demeanor also became more confident.

"Perhaps we can let Nobita Nobi participate in this county-level math competition. With Nobita's current level, he should be able to get a place. At the very least, participating in this kind of competition can boost Nobita's current morale and help his future." I, Eiichiro Naruto, thought to myself as I looked at Nobita.

"Nobita, are you interested in participating in the Tokyo Metropolitan Mathematics Competition? Our school has two spots this time, and I've decided to recommend you to participate. I think you're very likely to win a prize if you participate."

I, Cheng Rongyilang, quickly walked from the center of the classroom to Ye Tiancheng and earnestly invited him to participate in the prefectural mathematics competition held in Tokyo.

"Teacher, when is this competition held? Do I need to come to training every day?"

Seeing that Cheng Rongyilang seemed determined to be with him, Ye Tiancheng, as his teacher, couldn't very well refuse him outright.

"No, the Tokyo Metropolitan Mathematics Competition will be held in the middle of next month. There's still plenty of time. Besides, given Nobita's abilities, he doesn't need any of our pre-competition training. On the day of the competition, it will be enough for him to perform at his current level."

Seeing Ye Tiancheng's brows furrow slightly, Ichiro Cheng quickly waved his hand in denial, afraid that Ye Tiancheng would refuse his invitation.

You know, it's been a long time since Nobita's Tsukimidai Ward Elementary School has had anyone achieve a good ranking in the Tokyo Metropolitan Government's ward math competition for elementary school students. I, Narueichiro, was originally going to recommend Izuki Sugi, but after seeing Ye Tiancheng's ingenious problem-solving methods today, I, Narueichiro, immediately decided to let Ye Tiancheng participate in this competition.

"Alright then, I'll follow your instructions, teacher."

Ye Tiancheng calculated the time and found that the two had little impact. In addition, Cheng Rongyilang was giving him face, so it would seem too pretentious not to go.

"Yes, then the teacher will be waiting for Nobita to come back with good grades and bring glory to the school!"

As the crisp sound of the school bell rang, I, Cheng Rongyilang, patted Ye Tiancheng on the shoulder and happily walked out of the classroom with my lesson plan tucked in my sleeve.

"Da Xiong, how did your math skills suddenly become so good? Even I, Teacher Cheng, am very impressed with you."

Before I, Cheng Rongyilang, could even fully leave the classroom, Gian walked up to Ye Tiancheng and said to Da Xiong with envy.

"Yeah, yeah, how did Nobita suddenly become so amazing..."