I use Yugioh to battle the multiverse

Shidou, who always had blind faith in Katsu's words, felt shaken, but his inner hesitation disappeared with Katsu's words, "I believe you." Now, he was more determined in his heart.

"Huh---" After exhaling a breath of foul air, Shidou stood up, then turned around and looked in a certain direction---

Origami's goal is to defeat the spirit that killed her parents, and that target is probably──Phantom.

In this case, she would definitely appear at the fire scene in Tengu.

Shidou clenched his fists, made up his mind, and ran towards his destination.

Although he didn't know the exact time, the sun had already set. However, the midsummer sun's power had not diminished at all, and it was still blazing hot on Shidou's body. Every time he moved his hands and feet, he was covered in sweat, and it mercilessly took away Shidou's physical strength.

However, Shidou did not stop there. One of the reasons was that he was anxious because he did not know how long he could stay in this era. The most important point was that Tohka, Yoshino and others were fighting in the original era, so how could he just sit there and watch.

After running for an unknown amount of time, Shidou finally arrived at a familiar place.

"Nanko... district..." He slowly slowed down, whispering the name of the town in between his rapid breathing.

That's right. What stretched out before his eyes was the scenery of Nanko Town in Tengu before the fire.

It was a strange feeling. Seeing the scenery of the town where he once lived, Shidou felt a slight feeling of homesickness and nostalgia.

At this moment── "Ah!" Shidou discovered something and stopped involuntarily.

"Shidou, what's wrong?" Katsu asked in confusion.

However, Shidou did not answer Katsu's question right away---

At this moment, there was a house in front of him. It was a two-story house with a striking crimson roof. It didn't have any particularly eye-catching features... However, the moment Shidou saw it, he was as if he was stunned and couldn't move.

Because, that was the house where Shidou lived until five years ago.

However, Shidou did not stop just because he saw the house itself.

It was because the moment I saw it, a thought flashed through my mind.

Five years ago. Shidou is now in Tengu five years ago, the day when Origami's parents were killed by spirits, and she vowed in her heart to destroy the spirits.

However, that wasn't the only thing that happened five years ago. When Origami identified her enemy, the town was surrounded by flames.

——Surrounded by the hellfire caused by Shidou's sister, Kotori Itsuka.

Hayashi wants Shidou to contact Origami and go back to five years ago and "change" the fact that Origami turned upside down.

So Shidou thought: If that's the case... can we "change" the fact that Kotori was turned into a spirit by the [Phantom] five years ago? If Kotori is at home now, can he tell her not to go to the park today and remind her not to get close to the scene where she should have encountered the [Phantom].

When this thought crossed his mind, Shidou's feet subconsciously moved towards his old home. Although his memory was vague, on August 3rd five years ago, Shidou should have gone out to buy Kotori's birthday present. Logically, he would not have run into his old self. After Shidou skillfully opened the door, he walked along the courtyard to the back of the house.

However, at this moment, Katsu's slightly serious voice sounded in Shidou's mind: "Shidou! What do you want to do?!"

"I... I want to try to change the fact that Origami is reversed... Can I also try to change the fact that Kotori has become an spirit..." Shidou's tone was filled with hope and pleading---

However.

"No. Ahem... Shidou, the matter of Kotori becoming an spirit involves too many things. We can't be sure what the consequences will be if you successfully change this fact. It is very likely that when you return to the normal timeline five years later, the world will have changed drastically... Maybe some important people will disappear..."

"...!Ah──" Hearing Katsu say this, Shidou's eyes widened in surprise.

Shidou was overwhelmed by the possibility that Kotori didn't have to become a spirit, and didn't think things through carefully enough.

After Katsu said this, Shidou started to think again. If Kotori hadn't become a spirit at this time and place, she wouldn't have been discovered by Ratatoskr at all...

In this way... ...when I return to my own world, the world will have changed drastically...it is almost certain.

This must be avoided absolutely. Shidou gritted his teeth in fear and nodded slightly.

"…I'm sorry, it seems I lost my mind for a moment."

However, this time, unlike Katsu's boyish voice, another familiar magnetic and pleasant voice rang in Shidou's ears, "Hehe---the possibility of changing the past is both a wine that can drive people crazy and a poison---you can endure this, I have a new respect for you---"

Shidou frowned slightly---

"Kurumi... classmate?"

"Hmph." Kurumi snorted lightly and ignored Shidou, but Katsu spoke up and rescued him---

"Ah, Shidou, don't worry about it. Kurumi is right next to me. I can contact you thanks to Kurumi. As for what I just said, just remember it. You only have one task now, and that is to change the fact that Origami is reversed. The rest is a separate matter."

Although Katsu said so, if you think about it carefully, it is natural. I think every human being wants to have the possibility to change the past. Even Katsu can't imagine what kind of thoughts and troubles Kurumi has had so far, holding such power.

"Okay, I remember that." Shidou let out a light breath and emphasized again in his mind - the mission is to stop Origami from turning over, nothing else matters!

Just as Shidou closed his eyes and hypnotized himself---

"Mrs. Haruko Itsuka, I'm Naoko Szumoto from next door~~"

The sudden voice made Shidou open his eyes suddenly, and his eyelids twitched violently.

"Are you not here? I'll go in for a moment." After the voice said this, the sound of the door opening was heard.

The other party was Mrs. Naoko Szumoto who lived next door five years ago. She often distributed vegetables sent to her from the countryside to her home... Speaking of this, Shidou remembered that when he and his family were not at home, there were often vegetables placed under the eaves facing the backyard.

This matter itself is very grateful, but she is too bad at choosing the timing. Because Shidou is not the elementary school student who should be here, but a high school student five years later, so he is a suspicious person no matter how you look at it.

If Mrs. Naoko Szumoto called the police...

"What should I do...!" While Shidou was at a loss, Mrs. Naoko Szumoto's footsteps were getting closer and closer. Shidou looked around hurriedly, but could not find a place to hide. Everything was over---

Just then---

"Ah, Aunt Naoko, you're here..." A childish and pleasant voice rang out from the room.

Then, with Shidou's eyes wide open and a look of disbelief---

A young boy with back-length yellow hair, who looked like an angel doll, pushed open the door of the Itsuka family...

The boy glanced in Shidou's direction with his yellow eyes. He was slightly stunned for a moment, then raised his eyebrows, waved to Shidou, and pointed to the open door behind him.

Seeing this, Shidou was slightly stunned, then he trotted towards the direction of the yellow-haired boy in a daze, and then, at his signal, hid inside the door---

Then, the yellow-haired boy ran out of the courtyard alone, opened the gate, and started chatting with Mrs. Naoko in front of him with a smile.

… …

Under the dark night.

Kurumi's cheeks flushed slightly as she looked at Katsu beside her---

"Ah... Katsu-kun was so cute when he was a child~"

"..." Katsu was speechless for a long time, then he said in a daze—"Wait the system memory in this identity doesn't have me appearing here ."

After chatting with Mrs. Suzuki for a while, Shota Katsu took the bag of vegetables from her and said goodbye to her warmly. Then he returned to his room with the vegetables in his hand.

Shota Katsu exhaled, and under Shidou's extremely confused gaze, he put down the vegetables in his hand, the smile on his face gradually disappeared, and while sighing, he walked towards Shidou---

"Tsk---you're here, Shidou."

"...You---are Katsu?!" Shidou asked with a twitching mouth, which he had been doubting from the beginning.

"...Yeah --- that's right, but I'm not the Katsu you know --- maybe it's better to talk to you in this way..." As he spoke, a dazzling light emanated from Katsu's body ---

Shidou couldn't stand the bright light and closed his eyes.

After a moment, he opened his eyes again, and he couldn't help but be stunned---

There was no such thing as a young boy in front of him. The one in front of Shidou was a familiar boy...

Although compared to the Katsu he knew, the one in front of him was more evil.

"Katsu..." Shidou subconsciously called the name of the person in front of him.

Katsu waved his hand and then raised his hand and pressed it on Shidou's shoulder. In an instant, there was a mysterious connection in his mind.

"[Me], and Kurumi... should I say, long time no see? No, that's not right... you guys probably haven't seen me before... Um---never mind, anyway, let me introduce myself first, I'm Katsu from the future, of course, relative to your time and space---as for why I'm in the past relative to your time and space, there are very complicated reasons... to avoid unnecessary trouble, I won't go into details---" Future Katsu just said a lot of things, which made Katsu and Kurumi, who were in the future five years of this time and space, a little stunned--

After a long while, Katsu asked dryly: "You...are you my future self?"

"Ah, I guess so. Of course, the future is not predetermined. You can also think of it as a parallel world, but I failed so I am here to fix my mistake.---"

"...So, you know about the future? So what happen?"

"Tsk, I told you that the future is not predetermined. The future is not set on stone. Are you really me? How could my past self be so stupid that you couldn't even understand me? As expected, our relationship is in a parallel world, not the past and the future..."

"… …" Katsu stopped talking he wanted to go there and strangle himself.

On the contrary, Kurumi, who was holding Katsu's hand, laughed tenderly with a "puff"---

"It's Katsu-kun, his personality is exactly the same."

"…Do I have such a bad personality?" Katsu said with a smile on his face.

"It's very interesting." Kurumi held Katsu's hand and tightened it a little.

… …

Future Katsu's hand continued to rest on Shidou's shoulder. He cleared his throat, as if he wanted to say something. But just as he was about to speak, his eyes suddenly changed, and he immediately shut his mouth and said no more. He just said, "Just follow your original plan, don't worry about anything else - You should have met future Kurumi, her help should be enough for us to turn the tide. Of course, don't expect me to help you - the butterfly effect is still very scary."

"Wait..." Katsu seemed to want to say something, but Future Katsu didn't give him a chance at all. He just let go of the hand that was holding Shidou's shoulder, exhaled and said: "Okay, you can go. The stay time of [Twelve Bullets] is limited..."

"Alright, alright, do your own thing and stop complaining." Future Katsu waved his hands impatiently, and then a dazzling light burst out from his body again. Shidou raised his hand to block his eyes, but when he took it away again, he was surprised to find that he had gone deep outside the house without knowing when. Through the open door, he could clearly see that Katsu had turned back into his original shota appearance - and waved to Shidou again, telling him to leave quickly.

Shidou had no choice but to turn around and leave---

Looking at Shidou's back, Shota Katsu couldn't help but sigh---

"I hope this time I succeed."

"So you meet the future Kurumi that's why you know me so much" No wonder the first time they meet, Kurumi is so friendly to him. Katsu turn to Kurumi wanted to confirm his assumption.

"I admit, I did receive some guidance to collect more time and some information about the future, but I can't say it or more things will change. Just know that this time we will win Katsu~kun." Kurumi smiles as she gently caresses Katsu's face.