Eternal Gaiden 10: Warning of the Future

A year has passed since Sei's birth, and he was sleeping soundly on a crib while Dr. Gecko was doing some scan checks on him as she was taking notes. The doctor then heard a knock on the door.

"It's opened!" Dr. Gecko said, opening the door and walking into the room was Kyoya and Sala. "Oh Kyoya-sama, Salamandinay-sama, welcome."

"Hello Gecko, we wanted to check on our son. How is he?" Sala asked.

"He's doing remarkable well actually." Dr. Gecko told them as they walked to Sei's side. "There's no signs of his health deteriorating, and his breathing and heart rate is very strong."

"That's good to hear." Kyoya said as he and Sala looked at their son.

"Also I found something that is extremely remarkable." Dr. Gecko told him.

"Really? What is it?" Sala asked.

"Here take a look." Dr. Gecko said as she handed Kyoya and Sala a tablet which showed a scan of Sei's DNA. "I found this in Prince Sei's DNA when I was conducting scans on him, which showed a strange mutation in his genes."

"And that matters why?" Kyoya asked.

"Well if my theory is correct, then he won't have the need for modification or medication to remind in human form. And the same might be possible for his dragon form as well." Gecko told them which really surprised them.

"Wait...so you're saying that he'll be able to transform by will?" Sala asked.

"Well I still need to conduct more tests and research, but yes it might be possible. Not only that, give or take a few years. I think Sei-sama will be the key to bringing forth a new generation." Gecko told them.

Kyoya and Sala turned back at their son with proud smiles on their faces. Even though he was only a year old, Sei had brought forth a new future for everyone.

After they had left Sei to Dr. Gecko, Kyoya and Sala had left as they were now walking outside.

"Man it's almost hard to believe. Sei's only a year old now, and yet he's the key to bringing forth a new era." Kyoya said.

"Indeed. There really is no stopping the flow of time, but the world continues to keep on changing and we also have to change with it." Sala said with a smile as she looked at the sky before she noticed that Kyoya had grabbed hold of her hand.

"Yeah, that's true. We also have to make sure Sei finds a good bride too. We can't let some fan girl or a harlot have his way with him." Kyoya said and Sala chuckles to hear that.

"You really are a protective father, you know that right?" Sala asked and Kyoya pouts at her.

"Hey don't say it like that. Especially since, you were thinking the same too." Kyoya stated.

"Well I guess there's no denying that." Sala said as she averted eye contact from him. "I mean it would be nice to know that Sei would find a nice and pretty wife, when we're long gone, but not without seeing our grandchildren first though."

"Well, whoever he picks as a wife, I highly doubt she'll be as pretty as you though." Kyoya stated, which made Sala's cheeks turn red as she placed a hand on her cheek.

"Oh you smooth talker you." Sala said before they both chuckle. "Also I heard that Van is doing well too."

"Really? That's nice to hear." Kyoya said. "You know, I'm still not surprised that Tusk named his son Van of all things."

"Well, is it a name that is shared by both of Tusk-dono's parents. I found it incredibly loving too." Sala told him.

"I guess that's true…" Kyoya chuckles before he hissed as he felt a sharp chest pain where his heart, and Sala turned to him in worry.

"Kyoya, are you alright?" She asked.

"Yeah, I'm alright. It's just the chest pain again." Kyoya said.

This wasn't the first time this had happened either. During the past few months, Kyoya was experiencing the same chest pain for a while, at first it was minor and wasn't so bad and it often comes and goes, but lately it's been getting worse and starts flare up more often than usual.

"I don't know why but it's been getting worse lately." Kyoya said.

"Perhaps you should have Dr. Gecko or Maggie-san to check on that." Sala told her husband.

"Yeah...It's probably for the best." Kyoya mutters as he rubs on his chest.

Kyoya then heard his Stag Phone ringing before he brought it out and answered it.

"Hello?" Kyoya said.

"Kyoya, we may have a situation." Hayate told him through the Stag Phone and Kyoya blinks in wondering what this situation is.

After getting the call from Hayate, Kyoya and Sala had arrived at the courtyard of the temple and waiting for them was Hayate, Kaname, and Naga.

"We're here. So what's going on?" Kyoya asked.

"Take a look for yourself." Hayate told him as Hayate and the others turned to look at something.

Kyoya and Sala turned as well and saw static and electricity appearing in front of them as it formed a spiral motion.

"Okay, what is that?" Kyoya asked.

"We're not sure ourselves. When me and Hayate had arrived here, this thing just popped out of nowhere." Kaname told him.

"In any case we need to be ready for anything." Sala told them and they nodded in agreement.

Naga then noticed something about static and electricity.

"Everyone, look!" Naga told them and everyone turned to it as well.

They soon saw a portal made out of energy appearing in front of them and everyone got ready to defend themselves for what comes next.

They then saw someone limping out of the portal as it disappeared behind him.

It was the wounded Kamen Rider Seiryuu as he was panting and had his hand on his shoulder.

"W-What is that?" Sala asked.

Kyoya looked at the unknown armored figure and saw the belt on his waist.

"He looks almost like a Kamen Rider. But he doesn't look like anything I've ever seen before." Kyoya told her.

Sala then saw the blood on the ground and below Seiryuu.

"He's wounded. We need to help." Sala said as she was about to approach the wounded Seiryuu but Kyoya stopped her as he placed his hand in front of her.

"Sala, hold on. We don't even know if he's friendly or not." Kyoya told her.

As they were talking. Seiryuu looked around the area, and saw the blue sky and was amazed by its beauty. It was beyond anything he had imagined, the sky was shiny like a giant blue jewel, the white pure clouds looked so gentle and kind, and the beautiful and bright sun was so amazing to him.

"Kyoya, you can't be serious. That kind of thing doesn't matter, he is wounded and he needs help." Seiryuu's eyes widened as he recognized that voice as he turns to Kyoya and Sala.

"I understand that. But for all we can know this could be a trap." Kyoya told her.

"Even so…" Sala mutters.

Seiryuu's eyes were mostly on Sala, even though she looks so young and has pure black hair there was no mistaking that it was her.

"It's…" He mutters which got both Kyoya and Sala's attention as they turned to the wounded Kamen Rider. "It's really you…"

Seiryuu slowly limps to Sala as he reaches out to her, but Kyoya stood in his way as he walked in front of him.

"Hey, don't even think about it buddy." Kyoya said as he protected his wife, and Seiryuu's eyes blinked to see him.

"Wait a minute…" He said which made Kyoya blink. "Are you...Are you my…" Before he could finish, Seiryuu falls to the ground as his armor changes into light particles as he changes back into his civilian form.

"H-Hey!" Kyoya said as he reached out to him before he and Sala turned to each other and Sala gave her husband a stern look, which caused him to sigh. "Oh screw it. Hayate, help me with him. We need to take him to Dr. Gecko."

"Right." Hayate said in agreement as they walked to the injured stranger and carried him with his arms on their shoulders.

When Hayate gets a good look on the stranger's face he blinks a few times as he almost resembles Kyoya in some ways.

"Hey Kyoya, am I crazy or does he kind of look like you?" Hayate asked and Kyoya turned to the injured and sleeping stranger and saw the resemblance as well.

"Yeah...now that you've mentioned it, you're right." Kyoya said.

(Later)

After bringing the wounded stranger to Dr. Gecko, the DRAGON doctor was maybe to treat his wounds as he was now resting on a bed.

After that, Sala had contacted Ange about what happened, and she soon arrived at the Temple of Aura along with Ken, Salia, Hilda, Rosalie, and Chris, and Sala had brought Vivian and Ersha to the temple as well.

They were now in the stranger's medical room as they were standing beside his bed.

"So you're saying that this guy just walked out of a wormhole that appeared out of nowhere?" Ange asked.

"Yes, that's about the gist of it." Sala nodded.

"But that still doesn't tell us who this guy is." Chris said.

"Well about that…" Dr. Gecko said, getting everyone's attention as they turned to her. "After I treated his wounds, I did a DNA scan and it matches to-"

"Hey, he's waking up!" Ange calls out and everyone turns to the sleeping stranger as he begins to slowly wake up.

His eyes opened and saw people he couldn't recognize before he saw Sala as she looked at him.

"Are you okay? If not, you shouldn't overexert yourself." Sala told him, but the stranger didn't' say anything as he only stared at her as he became teary eyed, and everyone was confused on why he was crying.

"It's...It's really you…" He mutters before he sits up and hugs her. "Kaa-san!"

Hearing the stranger calling Sala 'Kaa-san' was a big surprise to everyone as he cried on her chest.

"Wow, since when did you guys have another kid?" Vivian asked.

"Since...never." Kyoya told her before he turned to the stranger. "Okay, care to tell me why you called my wife, mother?"

The stranger then saw Kyoya in the room as he blinked at him.

"Wait...Are you my father, Yagami Kyoya?" He asked and Kyoya was surprised to hear him ask that.

(Later)

After Future Sei had a moment to recover and regain some of his strength, he soon began to explain to everyone including his mother and father about his backstory.

"Okay...let me see I got this story straight. You're our son from the future, the reason you were able to travel here is because you used a time machine to get here, and that was 20 years from now, right?" Kyoya asked.

"Well, 18 years to be exact. But for the most part, yes." Future Sei told them.

"Normally, I would say that it was impossible but considering the stuff I've seen. I'm willing to believe it." Kyoya mutters to himself.

"Oh come on, you can't be serious, right?" Rosalie asked which got everyone's attention as they turned to her. "I mean sure traveling to different dimensions, and people transforming are one thing. But come on time travel there's no way, even for you guys."

But Kyoya, Hayate, and Ken avoided eye contact from the Norma which made her realize that she was wrong.

"No, wait seriously? You guys can time travel?!" Rosalie said in shock.

"Well no we don't, but we do know at least 9 Riders that travel through time more than once." Hayate said.

"Ten if you count that one time with OOO." Ken said as he remembers that OOO movie to celebrate the 40th anniversary.

"Okay, can we at least stay on topic, please?" Kyoya asked his friends.

"Right, right, sorry." Hayate, Ken, and Rosalie said.

"His DNA scan is the same with our Sei-sama's DNA. He's actually telling the truth." Dr. Gecko said as she showed the tablet which showed a match to both Seis' DNA.

"Then, Sei, can you tell us why you're here in our time?" Sala asked her son from the future.

"Of course. It's one of the reasons why I'm here, it's because I bear a warning to give you." Future Sei told them.

"A warning? Of what?" Kyoya asked.

"Well that depends. What's the current date?" Future Sei asked.

"It's July 20. A year after you were born." Hayate told him and Sei was shocked to hear that

"What, July 20?! And you're sure it's not March?" Future Sei asked.

"No...It's definitely July." Hayate said and Future Sei placed his hands on his face.

"No...No! I was supposed to arrive here six months before they arrived! How could've I made such a mistake!" Future Sei exclaimed in frustration.

"Sei, Sei, calm down!" Kyoya said as he grabbed onto his son's shoulders as he turned to him. "It's alright, you're here now and you have a message for us. So just calm down okay."

"Right, right...I'm sorry." Future Sei said as he calmed down.

Kyoya then let's go of his son's shoulders.

"It's alright. But anyway, you mentioned them but who were you talking about?" Kyoya asked.

"Alright...the reason why I'm here is because the world I'm from-" Future Sei said.

"No, no, no, wait!" Ken interrupted as he raised his hand as everyone turned to him. "Let me guess. The reason why you're here is because in your time the Earth is left a barren wasteland and most of the population was killed, because a threat in our future will soon arrive were the ones who caused it, right?"

Future Sei was left stunned by this and said. "Yeah...that's about it."

"Yes, I totally called it!" Ken said before Salia whacks him on the head. "Ow."

"Ken, can we stay focused, please?" Salia told him.

"Right, right, I'm sorry." Ken mutters as he rubs his head.

"If that's true, then Sei, who or what is this threat to our future?" Sala asked.

"They're known as the Four Elementals." Future Sei said as he remembers the Four Elementals. "They're alien life forms that originated from deep space, and they said they had conquered and destroyed over thousands of planets. Like their name states they have the form and have control of different elements. There's fire, water, wind, and earth. The power of these four are so immense that they're almost considered gods...no titans are more like it."

"Wait, what about us? Didn't we fight these guys?" Ange asked.

"You all did…" Sei said before he looked down in sadness and raised his head at them. "You all fought valiantly, but you all fell in battle against the Elementals. Hayate, and Ken including."

Hearing that surprised everyone in the room and Kyoya blinks in confusion why he didn't mention him.

"No way...that can't be true!" Hilda said.

"I'm sorry to say but it is." Sei told her. "In the end only a handful of survivors were left, including some of your children. There was me, Van, Alektra, Katsumi, Vivian, Mei, Maggie, and Dr. Gecko, were the only ones left...until it was me."

Sei then looks at his hand.

"Even though I became a Kamen Rider myself, I wasn't able to beat them. Their power was just too much." Sei said, which made everyone a little worried. "It's one of the reasons why I'm here. Is to find you, and warn and help you against the Elementals in the hope of changing that damn future."

"Okay, but when exactly will they be here?" Hayate asked.

Sei looks at them before he sighs.

"September 1st of this year." Sei said which surprised everyone.

"What? That's less than two months from now." Ken said.

"I know. I originally intended to come here 6 months before they'd arrived so that we'll better prepare ourselves...but sadly that was only wishful thinking. I'm sorry, I came here to give you hope, but instead I only gave you despair…" Future Sei said as he lowered his head.

Kyoya, Ange, and Sala turned at each other before they turned at their friends as they nodded at each other.

"Well it wouldn't be the first our backs were against the wall." Ange said, getting Future Sei's attention as he turned to her.

"She's right, this wasn't the first time we went up against god-like beings and we'll beat these Elementals." Hilda said.

"That is true. Even if our time is short, we'll be ready when they arrive." Sala said, and Future Sei was stunned to hear this.

"That's right. As long as we're alive there's always hope." Kyoya said.

"Everyone…" Future Sei mutters before he becomes teary-eyed and then chuckles and soon turns to Vivian. "They're exactly as you said they were."

"Hmm…" Vivian blinked in confusion.

"Oh I'm sorry. But in my time you often told me stories about my parents and your friends." Future Sei explained.

"Oh really? So was I like a mom to you?" Vivian asked.

"Well you were more like a big sister and mentor, but yeah I guess in a way you were." Future Sei said.

"Oh wow, that sounds awesome!" Vivian said before she heard Rosalie and Chris snickering behind her back and she pouted at them. "Hey! What are you laughing about?"

The other chuckles in amusement before Kyoya turns to his future son.

"But wait, you mentioned that Hayate and Ken were killed by these Elementals. But what about me? Didn't I fight with them too?" Kyoya asked.

Future Sei flinches before he lowered his head, and Kyoya and the others understood that he was keeping something important from them.

"Sei, something happened to me before they arrived, didn't it?" Kyoya asked and Future Sei nodded. "Then what is it? Sei, you have to tell us. This might affect all of us."

"Your father's right. Please, Sei, you have to tell us. We have a right to know. Kyoya has a right to know." Sala told her son.

"You're right...I'm just not sure how to explain this. But the reason why you weren't able to fight against the Elementals is because you never had the chance to do so." Future Sei told them which really shocked everyone as they slowly understood what the Rider of the future was telling them.

"Wait, so you're saying that…?" Kyoya said and Sei nodded.

"Yes. A month before they had arrived, you, my father or rather the Yagami Kyoya of my time, had died." Future Sei told him and the others.

Hearing that shocked everyone. Kyoya was even more stunned by this revelation as his eyes widened.

To be continued…

There you have it, I hope that you like it. Please review to tell me what you think.

Also special thanks to bloodyredrose again, for the first half of this Gaiden.