It was a sad day for one Rias Gremory. She had just lost the rating game for her freedom and now she's about to get married to an arrogant man. His name was Riser Phenex, he was born into the noble devil clan of the Phenex family.
The Phenex clan is gifted with the bloodline of the immortal bird, the phoenix. Just like the legends and myths say, the phoenix has the power to manipulate fire, and so does a member of the Phenex clan.
When Rias was born, her father, Lord Zeoticus Gremory, the head of the Gremory clan, had arranged a forced marriage with the son of Lord Marquis Phenex, the head of the Phenex clan, Riser Phenex.
The reason why they had to get married was because of the decreased amount of
Pure blood devils, also because if Rias and Riser had a child, and said child had both of it's parents bloodline it would turn out to be a "prodigy".
As the Gremory heiress is looking into the mirror in front of her, she can't help but cry. Cry for help, she never wanted to marry this arrogant prick, she never wanted to be born as such a high class person so that she could have this much responsibility from such a young age.
Her gaze was interrupted when yellow flames lit behind Rias and her maid, and out came Riser.
"Rias my dear, you look lovely in that dress." Riser commented with a smug smirk causing Rias to growl at him.
"Riser-sama this area is off-limits for men." The maid stated.
"It's fine, I'm the star of the party, and I came here to see my sexy wife."
"I'm not your wife Riser." Rias snapped at him. "And what's up with this dress?"
"It's perfect. It shows the demon world the bonding between the Gremory and Phenex household." He leans closer to Rias. "Besides, it will be easier to take off for our bonding time."
"Go away, I would never do such things with the likes of you!" Rias growled at him.
"Oh but my dear, if you wouldn't, then we wouldn't have a child, and if I'm not wrong, you always wanted one, am i right?" Riser smugly said and laughed before disappearing in yellow flames.
"A child huh?" Rias sadly looked at the mirror. "Yeah I wish, but definitely not with you."
"Please save me someone".
-X-
"DAMN HIM! DAMN THAT YAKITORI BASTARD, STEALING BUCHOU AWAY FROM US!" Issei yelled as he repeatedly punched the wall.
"Ise-san! Please stop your hand from bleeding!" Asia cried out in panic as she rushed to heal Isseis' hand.
"Kiba, you guys, can't we do something to prevent buchou from marrying that bastard?" Issei asks the group with a pleading look.
"We can't do anything or Rias and the gremory will lose reputation among the remaining pillars." Akeno sadly replied, making Issei clench his fist in frustration.
Just then they heard the door open, and someone walking in.
Said person has crimson hair and dark blue eyes. This person is a tall teenage boy that looks to be about their age. He's a 5'10 tall man, wearing a cloak and has a sword sheathed next to him. He looks at them and says.
"There might be a way to save mo-Your king."
"And how? Who even are you? Why should we believe you?" Issei asks for some hope in his eyes but anger is still evident.
"Allow me to introduce myself, my name is Uryū…"
-X-
Uryū looks around the room, full of people wearing fancy clothes. He looks for someone and finally sees her.
Looking at Rias he can't help but let a small smile on his face.
"You! How dare you interrupt this event!" Riser yells out causing Uryū to glare at him.
"I am here to free Rias Gremory from this forced marriage. I challenge you Riser Phenex to a fight to determine the gremory heiresses future! If you win, I'll give you this sword, it was made by Hephaestus and it was blessed by Great Red!" Uryū yells out, causing everyone to widen their eyes.
"Hohoho this is a turn of events, isn't it Grayfia?" A male voice said.
"Yes it is Sirzechs-sama." A stoic voice replied.
Everyone turned around to see the ruler of the Underworld with his queen/wife standing next to a surprised Rias.
"LUCIFER-SAMA!" Everyone minus Rias exclaimed while Uryū tensed his body.
'So, this is the guy mother always talks about, huh. I hope Miss Akeno gave him the information I needed for her to give him.' Uryū thought.
"Lucifer-sama let me kill this pathetic devil, and move on with the wedding." Riser suggested preparing a fireball, but stopped when Sirzechs put his hand up, telling him to stop.
"Relax Riser-kun, we're not going to kill him. Besides, he's pathetic, so what stops you from fighting him, I'm pretty sure you'll be able to defeat him." Sirzechs said.
"You're right Lord Lucifer, I should make a good example out of this trash!" Riser replied.
"All right then, Grayfia, please start the match." Sirzechs commanded to which Grayfia obeyed.
-X-
"ALRIGHT. The match between Uryū and Riser Phenex-sama will commence if both sides are ready!" Both fighters nodded their heads. "Well then let the match begin!" Grayfia announced.
"This match is over! Prepare to die!" Riser shouted, bringing out his flaming wings and charging at Uryū.
Uryū for his part just extended his hand and all of a sudden Risers fire wings started to disappear. Riser for his part was shocked and so was everyone else.
"HOW ARE YOU DOING THAT YOU SCUM!" Riser shouted.
"Fire doesn't affect me. When I was a kid I found sacred gear. It wasn't anything special at first, however I trained with it, so much that it can be in the top ranks for sacred gears. LET ME SHOW YOU MY SACRED GEAR. FLAME DEVIL EMPEROR!"
Flames started to surround Uryū and it became a giant pillar, the flames started to change colors, to red and switch to yellow. When the flames died down it revealed something shocking. Uryū's upper clothes were burnt and weird markings started to show on his body (Think sasuke stage 1 curse mark).
Everyone was looking at Uryū with shock, awe, and also fear. Rias for her part, felt hope, because this random person has the power to save her.
Riser for his part was angry but also very scared. Who did this trash think he is?! Crashing his party, challenging him and now getting the upper hand on him?! "Riser does NOT accept this! Riser will win and have Rias for himself!"
Uryū just looked at Riser with a bored expression and ran at him, and punched him in the face. Riser quickly regenerated and started to laugh. "YOU SCUM THINK YOU WILL BE ABLE TO DEFEAT ME? I AM RISER PHENEX AND I AM IMMORTAL!" Riser started to power up until he took on a form that resembled a phoenix. "NOW WHAT WILL YOU DO? NOTHING! I POSSES THE POWER OF A PHOENIX! I AM NOW TRULY IMMORTAL!" Riser continued to laugh.
Uryū however, also started to laugh, at first it was chuckling but now it's full blown laughter.
"You are so arrogant you forget that you can keep regenerating just because you still have magic. Tell me Riser what will you do when you run out of magic? NOTHING!" Uryū started to laugh, however his laugh resembled Risers too much, a bit too much.
Uryū then stopped laughing and scowled. Looking at Riser, Uryū unsheathed his sword and started to pour magical energy into it.
With Rias and the others
"Hey doesn't the red magic thing look a lot like buchous' magic?" Issei asked, genuinely confused.
Around him people were very shocked. No one said anything. it was so silent until Lady Venelana Gremory shouted.
"How can he use the power of destruction!? Sirzechs? Did any of you father any children?! You irresponsible idiot!" Venelana shouted at him, thinking that this Uryū was the illegitimate child of her son. However, he quickly denied the claim, and Venelana could tell that he was telling the truth.
Rias and her peerage were very surprised, especially Rias herself, afterall his power of destruction looked almost the same as her own, if it wasn't for the flames that appeared on the tip of his sword.
Back to the fight
"W-what the hell!" Riser exclaimed. "How do you have that power! That power belongs to Bael and Gremory!"
"I haven't introduced myself fully yet have I? My name is Uryū Phenex. I come from the future to save my mother Rias Gremory from this horrible marriage. I am your son. But to me, you are not my father. You were never there for me or for my mother, when she gave birth to me, you cast her aside, as if she was nothing more than a toy. I grew up thinking why she was always so sad, why she was always praying for someone to help her. Did you know that the name Uryū means "Rain Dragon" in japanese? I was named after the person she loved. What was his name? Issane? Issei? something like that. Apparently when I was born it was raining, at first she wanted to name me Ryuu, just Ryuu "Dragon" however the rain convinced her to change the name." Uryū said.
Silence ensured the entire underworld. This guy was the son of Rias Gremory and Riser Phenex? He was some time traveller? He came to save his mother? It all seemed so fake, but then again, they were devils, and devils were supposedly fake too.
"When I was growing up, I never knew anything about you, and when I asked, I was given no response, just sobs." Uryū said, with a tear running down his face. "Mother always begged me not to become someone like you. But after constant nagging I finally got the explanation I needed. I was so angry that I vowed to myself that day that I'll save my mother." Uryū exclaimed with an angry face.
He calmed down and then started again. "I started training in secret, I trained the powers that came with my bloodline. I also trained the sacred gear that I found. But I knew it wasn't enough. I couldn't save my mother like that, she was already broken. So I did a despicable act. I started learning forbidden magic."
Everyone had their eyes widened. Forbidden magic was forbidden for a very good reason. Forbidden spells didn't need magic, no it needed a sacrifice. So what was his sacrifice?
"I created my own spell. It's a time travelling spell. However, the sacrifice that came with it. Do you want to know what I needed to pay for my despicable act?"
Riser nodded fearfully.
"I needed to pay my lifespan. Of course that's not a problem, Devils can live up to 10 thousand years. However this spell was so strong that it took 8,600 years of my lifespan." Uryū revealed.
Once again, no one said anything. This spell was forbidden for a very good reason
Uryū then narrowed his eyes and pointed the tip of his sword at Riser who was a bit away from. "Now, let's stop this talk, and let me beat the shit out of you!" Uryū then dashed forward, splitting the distance really quickly.
Fast! everyone thought.
Uryū brought his sword and slashed down at Riser, cutting Risers' arm. Riser roared in pain and started going berserk. Uryū ignored it as he thought that the bastard deserved what he was getting and slashed down again, this time cutting off his other hand. Uryū brought his hand and choked it around Risers' neck making a choker with the power of destruction.
"You lose"
As Uryū was about to explode Risers' neck, someone came and stopped Uryū from doing so. This person had crimson red hair, green eyes, was in a wedding dress, and had tears running down her face. This was Rias Gremory, his mother.
"Stop, please stop." Rias begged. Uryū was shocked, after all he'd said about this monster that he was about to kill, did to her, she went and protected him?!.
"Get out of my way. I don't want to hurt you." Uryū replied coldly. Rias shivered, this boy infront of her was supposedly her son, he came to protect her, but instead, threatened her?! She was angry.
She slapped him.
Uryū stood there shocked. "GET OUT OF MY WAY." He shouted, but to no avail as she hadn't moved from there. "Fine, i won't kill him," she looked a bit hopeful but then he continued "I won't kill him if he surrenders RIGHT NOW." He said the last part louder and angrier.
Rias turned to Riser and said "Do you want to surrender, or lose your life?" He nodded fearfully.