A/N: Hi minna-san! Recently some kind of very crazy idea invaded my mind. For some reason I felt an urge to combine Vanguard and Yu-Gi-Oh in one fiction.

The story is about the fifth counterpart of Yuya. He is from a dimension that nobody have knowledge about, even Academia. Our hero is from Ritual Dimension, the fifth dimension of the world. He was sent to Standard by Professor. D to investigate the other dimensions.

The story started after the Yuzu met Yuto. One more thing is I dislike the English names and will use only Japanese versions.

Story start.

Somewhere in Maiami City

At the top of a tall building, a portal suddenly opened and a figured step out from it. It was a teenage boy wearing high collar T-Shirt and a pair of dark jeans. He has silver hairs but the bangs are bright blue in color. One of his eye was crystal blue while the other is dark red and he is looking around to determine where he is now. His hairstyle is like Aglovale, but the side bangs were longer

"Man, Am I really in Standard? I better be or I will kick that geezer's ass" muttered the teen and walked forward and began to look around.

He took a sit at the edge of the top of the building and muttered to himself. "According to Professor. D, the current world was divided in 5 dimensions. However people didn't know about Arum, because of the position where we are situated. Let's see. Standard, Heartland, City and Academia. Professor also told me to investigate the other 4 dimensions because he heard a rumour that Academia is invading other dimensions and trying to conquer them.

The leader of Academia is Akaba Leo. Also he is originated from Standard. That means what I should do now is to find out more about LDS"

But suddenly the teen remembered something and shouted out in horror. "Gahh! I forgot to warn Mari about my leaving! Next time I see her she is gonna scold me for sure!". The teen shook his head and hugged himself while shivering. "Forget scolding! She is gonna skin me alive!"

After a while, the teen sighed heavily and muttered. "Tch, well I don't care anymore..."

So the teen stood up and looked at his Duel disk with a smile. He pressed a button on the Duel disk and a purple beam shot out from it forming and aeroboard.

"Let's explore this dimension, Helios!" The teen exclaimed and jumped on the aeroboard and flew away. However he forgot the fact that he is in different dimension and that action has attracted lots of attention from this dimensions teen bellow him.

"Woah! Look at the sky! There is someone is flying on a board!"

"Is that some kind of new technology produced by Leo Corporation?"

"I wanna that board as well~"

The teen only now remembered that he was not in his native dimension and scratched his head and winced. "Atta! I completely forget that the people in this dimension didn't know about this kind of technology!"

With Yuya and his friends

Yuya, Yuzu and the three kids also noticed the unknown flying object.

"Woah! That stuff is awesome! I'd like to try that as well!" exclaimed Yuya looking at the leaving UFO in excitement.

"Yeah, I'd like to ride that as well, Yuya-niichan!" Tatsuya shouted out as well.

Gongenzaka though noticed Yuzu looking at her bracelet very intensely and decided to ask her. "What's wrong, Yuzu?"

His question snapped Yuzu out of her trance. She shook her head and replied with a forced smile. "Nothing is wrong. I just felt somewhat strange when I look at that flying board for some reason. But maybe that was just a feeling"

Gongenzaka narrowed his eyes and stared at Yuzu's back after the later turn her back to him.

'What's going on here? Why bracelet is glowing? Could it be that the person flying on that board also look like Yuya, like the person I met some days before' thought Yuzu while holding on her bracelet. She recalled the appearance of a duelist that look exactly like Yuya. He appeared all of a sudden when she was about to duel Sawatari Shingo. At first, she couldn't recognize him because he was wearing a face mask. Not only that but that duel was one of the weirdest duel she had ever seen. On the first turn, the mask duelist couldn't summon a monster and set all his cards and end the turn. She thought that he was a novice that couldn't duel properly. However that change after he Xyz-summon Dark Rebellion Xyz Dragon.

After the duel, he removed his mask and she was perplexed to see Yuya's face under the mask. However that was not Yuya, because the bracelet shone once again and that person disappeared, and then Yuya appeared.

This time when she looked at the UFO, her bracelet also began to shine. She suspect that the person on the board maybe another Yuya-look-a-like.

Leo Corporation

Certainly all that ruckus got the attention of the chief of Leo Corporation, Akaba Leo's son, Akaba Reiji.

Reiji was hailed as the prodigious duelist. Nobody has ever seen him going all out. He was aware that some unknown duelist appeared and defeated Sawatari Shingo, furthermore he is an Xyz-user. According to Shingo and his goons, the unknown had asked about LDS and how is their connection to Academia.

Reiji was in Academia only once and by accident. However he knew one thing for sure is that his father is the one controlling that place. And now one more unknown appeared, and he has some technology that is out of this dimension. Reiji wanted to capture him for questions. Clearly, the unknown is not from Academia, but that still didn't mean that he worked for them as a spy.

And so he decided to call the top duelists from three course and gave them a mission to capture the newly appeared unknown.

Reiji glanced calmly at the three in front of him with estimating look. He looked at the teen that is standing on the far left
of the crew. He has a strange hairstyle in a shape of bull horns and both his outfit and hair color is purple. Also he wears a gold circlet that has a star on the left side of his head. His name is Shijima Hokuto and he is considered the strongest Xyz-user in LDS.

Next to him was a dark skinned girl. She has red eyes and black hair that reaches past her shoulders. Her outfit consists of a blue top and under that, she wears a one-pieced shirt and shorts which is a light yellow color. Underneath that, she wears black skin-tight shorts that end just above her knees. On her blue top, she wears her LDS pin. Her shoes are a dark blue. Her name is Kōtsu Masumi and she is also considered being the strongest Fusion-user in LDS.

And last but not least is Tōdō Yaiba, the last member of this team and also the strongest Synchro-user in LDS. Compared to Hokuto Shijima and Masumi Kōtsu, Yaiba is the shortest of the three. He has long brown spiked hair that reaches right above his waist and yellow eyes. His outfit consists of a white sleeveless jacket with a red collar. On his red collar, he wears his LDS pin. Underneath his jacket, he wears what appears to be a two-piece navy blue long-sleeved shirt with pants. He wears grey and red shoes and carries his deck in a black holster which he wears around his waist. Yaiba also carries a kendo sword also known as a shinai.

"I am sure you three are aware of the unknown that is using a fly board to move around Maiami City?" asked Reiji and interlaced his fingers. The three of them nodded their head. Reiji continued after seeing their reaction. "I want you three to split up and bring that person to me"

"Did he really make you that curious, Reiji-san?" asked Hokuto.

Reiji nodded his head and replied. "Ÿes, the flying board aside, I have a feeling that this unknown is a very decent duelist as well. That's why I call for you three specifically for this mission"

"Heh, I always want to fight strong opponents. Don't worry Reiji-san, we will find him in no time" Yaiba assured the chief with a confident grin.

"Yes, we won't disappoint you, Chief" said Masumi and bowed down.

Reiji nodded his head and decided to remind them about one more thing. "Also don't forget that you three will be the represents of LDS to fight against You Show Duel School"

"Tch, they wouldn't stand a chance against us, Reiji-san" Hokuto scoffed and exclaimed arrogantly. "Surely Sakaki Yuya has Pendulum Summon, but that still won't be enough to win against top three users that has mastered Xyz, Synchro and Fusion"

"Either way I am counting on you guys" stated Reiji. The team nodded their head and left the cabinet.

With our unknown hero

The unknown duelist decided to walk on foot to avoid any unnecessary attention. Right now he is walking on the street and wandering around. To hide his appearance, he wore a vizor to cover his heterochromic eyes. Sudden his stomach made itself known by grumbling. The teen rubbed his stomach and muttered.

"And now I am hungry. Man, I don't have any money of this dimension. How can I buy anything?"

The dimension traveler decided to sneak in a nearby shop to steal some foods. Yeah, he is that hungry. However, unfortunately for him that moment Yaiba walked by and saw someone was about to steal some food.

"Hey! What do you think you are doing?!" exclaimed Yaiba rather loudly that attracted the attention of a salesman.

The unknown cursed and ran away as fast as he could. Seeing that, Yaiba decided to chase after him.

"Hey! Wait up!"

The unknown ran away into the same garage where an Xyz-user and Shingo had dueled. Yaiba caught up to him and glared at the unknown and exclaimed.

"Now you don't have any way to escape. Surrender yourself!"

The unknown looked around to search for the escape route, but there was none. He hardens his eyes and activated his duel disk, which caused Yaiba to grin.

"Hoh? So that's what you have in mind huh? Ok, I will take you on" exclaimed Yaiba with a smirk and activated his own duel disk.

Yaiba: 4000 LP
Unknown: 4000 LP

"Duel!" shouted outed both duelist and the duel started.

"I will go first!" stated unknown duelist and took out a half-red and blue card then reveal it to Yaiba. "When there is no monster on my field, I can Special Summon this monster without release. Come! Mate monster, Liberator of Oath, Aglovale!"

Immediately a young man with white armor and wore a hood appeared on the field. In his hand is a sword that is releasing blue flames from it.

Liberator of Oath, Aglovale/Lv 5/Mate monster

ATK: 2200
DEF: 1500

Yaiba's eyes widen in surprise to see one more card with multi colour. He thought only Pendulum monsters are multi-colored.

"Mate monster? What is that I have never heard about it before?" wondered Yaiba looking at his opponent for explanation.

"You will understand what that means when the time came" replied unknown with a grin. "I activate Aglovale's effect, when he is Normal or Special Summoned, I can add a Ritual monster from my deck". A card flew out of the deck to unknown's hand. The unknown revealed the card to Yaiba. "I will add Bluish Flame Liberator, Percival to my hand. I set a card face down. Turn end"

The unknown set a card to the field and end his turn.

"And that's all? I am a bit disappoint, but whatever. It's my turn, draw!" scoffed Yaiba and draw a card. He look at his hand and picked up a card and put it on monster zone. "I summon XX-Saber Boggart Knight!"

A Goblin wearing an armor and holding a sword appeared on Yaiba's field.

XX-Saber Boggart Knight/Lv 4/ Effect Monster

ATK: 1900
DEF: 1000

"I activate Boggart Knight effect, when I Normal Summon him to the field, I can Special Summon Lv 4 or lower X-Saber from my hand. So come forth XX-Saber Fulhelmknight!"

A blond long haired warrior appeared next to Boggart Knight holding a chain sickle in his hand.

XX-Saber Fulhelmknight/Lv 3/ Tuner Monster

ATK: 1300
DEF: 1000

Yaiba grinned even wider and revealed a card in his hand to unknown duelist while talking. "If I have 2 or more X-sabers on the field, I can Special Summon XX-Saber Faultroll to the field!"

A masculine warrior that is holding a huge sword appeared next to Fulhelmknight and Boggart Knight.

XX-Saber Faultroll/Lv 6/ Effect Monster

ATK: 2400
DEF: 1800

The unknown duelist looking silently at Yaiba's monster and muttered to himself. "There is tuner there. So he is gonna Synchro Summon, eh?"

Yaiba looked at the unknown with a raised eyebrow and exclaimed. "Hoh? So you actually know about Synchro Summon? Then I will demonstrate you my power right now!"

Yaiba raised his palm up and chant. "I tune Lv4 Boggart Knight with Lv 3 Fulhelmknight"

Boggart Knight flew up high and turned to stars while Fulhelm knight turned to green circles and enveloped them. "Wielder of crossed blades of light. Tramp over this mountain of corpses. Synchro Summon! Appear! Level 7! X-Saber Souza!"

The Synchro Summoning emanated a very bright light and when it died down a whole new monster appeared on the field.
It was a masculine warrior that has a beard and holding twin swords.

X-Saber Souza/Lv 7/ Synchro Monster

ATK: 2500
DEF: 1600

The unknown narrowed his eyes under vizors and muttered. "Attack of 2500?"

Yaiba smirked wider and exclaimed. "I am not done yet! I activated XX-Saber Faultroll effect, to bring back Lv 4 or lower X-Saber from my grave. So come back XX-Saber Fulhelmknight!"

Faultroll slammed his giant sword to the ground and a purple hole opened up. Fulhelmknight jumped out from it and rejoined his ally.

"Now I tune Lv 6 Faultroll with Lv 3 Fulhelmknight. Let your silver armor shine! Crush the hope of all those who oppose you! Synchro Summon! Level 9! XX-Saber Gottoms!" exclaimed Yaiba and Synchro Summon one more powerful monster.

It was a huge warrior with a helmet that hid his face. He is holding a huge blade and put it on his shoulder.

XX-Saber Gottoms/Lv 9/Synchro Monster

ATK: 3100
DEF: 2600

The unknown still didn't show any panic in the presence of two powerful Synchro Monsters.

"What's wrong so speechless that can't even utter a word? Battle! Souza attacks Aglovale" Yaiba shouted out and ordered his monster to attack.

Souza grinned wickedly and jumped up high with intend to cleave Aglovale in half. However just as his attack was about to hit, the unknown duelist took action.

"I activate Trap card, Emergency Support. Emergency Support will increase my monster's attack by 1000 until the end of this turn and I can draw a card" stated the unknown and pressed a button to activate his face down.

Liberator of Oath, Aglovale

ATK: 3200

Then the unknown draw a card and look at it.

Yaiba squinted his eyes in displeasure and muttered. "3200 attack point! That is higher than Gottoms attack as well. Tch, I placed a card face-down and end my turn"

Yaiba put a card face-down and end his turn.

"My turn. Draw!" said the unknown and draw a card. He looked at it and then revealed 1 card in his hand to activate it. "I play Ritual Spell, Heaven's Flame Warrior Call. I release Lv 2 Physical Force Liberator, Zorron and Lv 4 Liberator of Royalty, Phallon. The mightiest warrior that hold the power of sacred flame. Burn the enemy to crisp with your flaming holy blade! Ritual Summon! Come on! Level 6! Bluish Flame Liberator, Percival!"

The unknown shouted out and raised his palm to the sky. After the activation of Ritual Spell, two altars appeared before both duelists. And they blaze up in blue flame when Zorron and Phallon were put in them. The altars shot out two huge pillars of blue flames and they began to swirl to the centre. Then from the centre of the swirl, a warrior with long spiky blue hair appeared. In his hand is a blazing sword of blue flame like Aglovale, but longer.

Bluish Flame Liberator, Aglovale/Lv 6/Ritual Monster

ATK: 2400
DEF: 2000

Yaiba looked surprised to see a Ritual Summoning. That was no surprise, because nowadays practically nobody used Ritual Summon. They prefer Synchro, Xyz or Fusion over Ritual, not to mention a newly discovered Pendulum Summon. So certainly someone used Ritual Summon was very unusual for Yaiba.

"Ritual Summon? Why are you using such old fashioned way of summoning?" wondered Yaiba curiously.

The unknown snickered and stated. "Old fashioned, you say? That's where you are wrong! My Ritual Summoning is far beyond, what you have ever seen before!"

"I activated Percival's effect when summoned. I mill two cards from my deck and if any of them are monster cards then I can decreased your monsters by the amount of their attack point" continued the unknown.

"What did you say?" exclaimed Yaiba in shock.

The unknown picked up two cards from his deck and smirked. He showed those cards to Yaiba so that the later could see them. "Both of them are monster cards. Lv 2, Liberator of holy tree, Elkia and Lv 3, Fire Passion Liberator, Guido. And I also activate Elkia's effect, if she was put into the grave by Liberator monster's effect, I can increase my LP by 300 for each Liberator on the field"

Liberator of holy tree, Elkia/Lv 2/ Effect Monster

ATK: 500
DEF: 300

Fire Passion Liberator, Guido/ Lv 3/Effect Monster

ATK: 500
DEF: 1000

The unknown spread his arms, closed his eyes and Elkia flew out of the grave and blew a mint mist at him, recovering his life.

Unknown: 4000+300+300= 4600 LP

Then he opened his eyes and looked at Yaiba with a smirk. "And also Gottoms and Souza power will decreased by 1000"

X-Saber Souza

ATK: 2500-1000=1500

XX-Saber Gottoms

ATK: 3100-1000=2100

Yaiba gritted his teeth in frustration, while the unknown has a smirk on his face.

"Battle! Aglovale attacks Souza! Blue Flame Slash!" Unknown duelist ordered for his monster to attack.

2200-1500=700 Dmg

Aglovale wordlessly rushed at Souza and slashed him with his blue flame sword.

"Argh!" Yaiba shouted out and covered his face.

Yaiba: 4000-700=3300 LP

"Percival! Sacred Punishment!" Unknown ordered for his monster to attack Gottoms.

2400-2100=300 Dmg

"Kuso" cursed Yaiba while covering his face.

Yaiba: 3300-300=3000 LP

"I end my turn here" stated the unknown without setting any face-down.

"Now you've done it. I will pay you back 100-times! My turn! Draw!" Yaiba glared in frustration and draw his card. He looked at the card that he drew and smirked widely. "Alright! This will be your last turn, Ritual-tsukai-kun!"

"I summon XX-Saber Ragigura" stated Yaiba and summon a new monster.

The monster has a shape of a green lizard and holding a dagger.

XX-Saber Ragigura/LV 1/Effect Monster

ATK: 200
DEF: 1000

"Ragigura's monster effect kicked in! When he was Normal or Special Summoned, I can add X-Saber from my grave to hand. And I chose XX-Saber Faultroll!"

Yaiba returned Faultroll to his hand and grinned evilly. "This is the beginning of your end Ritual-tsukai-teme! Trap, activate! Gottoms Emergency Call!"

Yaiba revealed his face down and started to explain its effect. "If I have X-Saber on the field then I can Special Summon 2 X-Saber from either players' grave. Come back! Souza, Gottoms!"

"And now you have 2 or more X-Saber on the field, that means you will Special Summon Faultroll again, right?" deduced the unknown duelist while snap his fingers and pointed at Yaiba.

"Bravo, for having good memory. But that won't save you! I Special Summon Faultroll once again" exclaimed Yaiba loudly. "Faultroll monster's effect! I will bring back Fulhelmknight again!"

After Fulhelmknight was back to his field , Yaiba took the next move. "Level 6 Faultroll, Level 3 Fulhelmknight, tuning! Let your silver armor shine. Crush the hope of all those who oppose you. Synchro Summon! Level 9! Appear! XX-Saber Gottoms!"

"The second Gottoms?" muttered the unknown duelist with narrowed eyes.

"Now I activate Souza's monster effect. By releasing 1 X-Saber from the field, he can destroy 1 monster without damage calculation" stated Yaiba and released Ragigura.

"What?" exclaimed the unknown duelist in shock.

"Battle!" Yaiba shouted out in glory. He could see the victory right in front of him. "First Gottoms, attack Aglovale!"

Gottoms jumped up high and slashed Aglovale in half. The later could only cried out in agony before he was dispersed.

3100-2200=900 Dmg

Unknown: 4600-900=3700 LP

"Urgh!" the unknown grunt and countered. "But when Mate Monster is destroyed by battle instead of going to the grave it will be sending to Extra Deck!"

Yaiba widened his eyes hearing that. "What? But that's just like Pendulum Monsters!"

The unknown cocked his head aside and wondered. "Pendulum Monsters? Never heard of them before"

"Either way it's the end for you! Souza, attack Percival! And with his effect, Percival will be destroyed without damage calculation!" Stated Yaiba with a grin.

Just as when Souza was about to slash at Percival with his glowing twin sword, the unknown decided to take action. "I activate effect of Halo Liberator, Mark from my hand. On either player's turn I can discard him to avoid 1 Liberator from the destruction by battle and card effects until the end of the turn. That means Souza's effect is negated!"

"Grr! However you will still take damage" Yaiba gritted his teeth in anger and shouted.

2500-2400=100 Dmg

Unknown: 3700-100=3600 LP

"Second Gottoms, attack Percival!" Ordered Yaiba.

The second Gottoms rushed at Percival and attempt to cleave him in half. However due to Mark's effect, Percival still remain on the field

3100-2400= 700 Dmg

Unknown: 3600-700= 2900 LP

"Tch. I end my turn" stated Yaiba in frustration.

"My turn then. Draw!" stated the unknown and drew a card. He put it in hand and began checking his grave.

"Hmm, 4 monster cards in grave. The condition is fulfilled" muttered the unknown duelist.

"What are you mumbling about? Hurry up and go with your turn already!" Yaiba shouted out irritatedly.

The unknown duelist looking up at Yaiba and declared. "This turn I will show the evolution of Ritual Summon!"

"Evolution of Ritual Summon?" repeated Yaiba questionably.

"Yes, and look carefully. This type of summon you can't see any using here" stated the unknown duelist and put his palm on top of Percival card.

Yaiba is looking very intently at his opponent after his declaration.

"Seek the mate!" the unknown duelist cried out and Percival raised his sword high up to the sky and released a golden stream. The 4 monster cards in Unknown's grave return to bottom of his deck. "You, who received the power of Heaven's flame. Line up here! Legion!"

Yaiba was completely speechless and his mouth agape, when Aglovale flew out of Unknown's Extra deck and linked with Percival.

The unknown has a very amused smirk seeing the shocking expression on his opponent's face.

A/N: What do you guys think, eh? By the way Yuya's fifth counterpart name is Yuusha, and Yuzu's Ritual dimension counterpart name is Mari. Before you guys asked that question. Yeah, Yuusha's dragon is a renamed Prominence Core.

Legion's effects will be explained in the next chapter. Hope you guys enjoy this chapter.

Cards:

-Monster cards

Liberator of Oath, Aglovale
Level: 5
Types: Mate Monster/Warrior
Attribute: Fire

ATK: 2200
DEF: 1500

If there is no monster on your field, you can Special Summon this card without release. When this card is Normal or Special Summoned, you can add 1 Ritual monster from your deck.

Permanent: If this card is in Legion, it can't be effected by effects.

Liberator of holy tree, Elkia
Level: 2
Types: Fairy/Effect
Attribute: Wind

ATK: 500
DEF: 300

If this card was sent to the grave by the effect of Liberator, you gain 500 LP for each Liberator on the field.

When this card was sent to the grave for Ritual Summon. The Ritual Monster won't be effect by Trap cards.

Fire Passion Liberator, Guido
Level: 3
Types: Warrior/Effect
Attribute: Fire

You can discard this card to add a Ritual Spell card with Heaven's Flame in it's name to your hand.

When this card was sent to the grave for Ritual Summon. The Ritual Monster gains the effect: if this monster attacks a monster in defense mode, and your monster's attack is higher than your opponent's defense, your opponent will take damage equal to the difference between the attack and defense of battling monsters.

Bluish Flame Liberator, Percival
Level: 6
Types: Ritual/ Warrior
Attribute: Fire

Must be first summoned with a Ritual Spell card, Heaven's Flame Warrior Call. When this card is ritual summoned, you can send two top cards from your deck to the grave. If any of them are monster cards all your opponent's monsters attack will decrease by the amount of the monsters that were sent to the grave.

Legion: Ritual Monster ATK+ Level of Mate Monster x100, Liberator of Oath, Aglovale (you can return 4 monster cards from the grave to the bottom of your deck to perform Legion). If this card stand in Legion, you can look at the top 4 cards of your deck and choose 1 Liberator amongst them and Special Summon it. Then this monster will gain attack equal to the Special Summoned monster until the end of the turn

Trap cards
Type: Normal

Emergency Support

When your opponent declared attack, you can activate this card, if you do 1 of your monster gains 1000 attack and you can draw a card

Spell cards

Heaven's Flame Warrior Call
Type: Ritual

This card is used to Special Summon Bluish Flame Liberator, Percival from your hand.

If you have Legion on the field, you can banish this card from the graveyard to add a Liberator card from your deck to your hand.