When Riku got home that night, he quickly met up with his adoptive father Kojiro.
Kojiro: "Son! Where have you been? You don't usually take this late to get home. You missed Akari hours ago!"
Riku then gave an embarrassed chuckle as he scratched his head and said: "Yeah sorry about that dad. I got a little too into playing with my friends this afternoon."
Kojiro: "Well try to make sure you don't come home so late next time ok? Your Mom and I we worry."
"Dear is Riku back yet?" Said Riku's adoptive mother Nami as she walked out from the kitchen.
Riku: "Yeah I'm back Mom what's for dinner?"
......
When Riku entered his room, he couldn't help remembering the things that happened before he got home as he sighed and muttered: "So that thing that appeared on my face earlier... was a sacred gear huh."
Right after Serafall appeared earlier, she immediately explained to him that the visor he was wearing was most likely a sacred gear however it didn't seem to be a sacred gear that she was aware of.
After that she simply said...
"Don't worry Ri-chan just go home and rest. I'll call my beloved So-tan and her servants to help me clean up this mess!"
Thinking about this, Riku couldn't help but lie on his bed as he muttered: "First I became a devil, now I apparently have a Sacred Gear... What's next, I have a dragon inside me too?"
"Oh well... whatever... I'll worry about these things tomorrow." Said Riku as he closed his eyes and began to sleep.
......
"Eh?!" At this moment Riku suddenly found himself in a space that seemed to be filled with starry lights.
Seeing this Riku simply muttered: "I'm... definitely dreaming right?"
Suddenly a loud voice sounded from behind Riku.
"It's been awhile my duelist."
When Riku turned around to see who it was...
"GAAH!!!" Shouted the reincarnated boy as he backed away frantically.
In front of him was a gigantic blue dragon completely covered in blue and white starlight.
After a few moments, Riku began to recognize the dragon as he pointed at it and said: "Y-Y-You're.... G-Galaxy-Eyes Photon Dragon?!"
As the monster card he used the most in his previous life during the time he was a yu-gi-oh player, he had naturally been able to quickly recognize who this dragon was.
"Yes it is I my duelist.... Galaxy-Eyes Photon Dragon!" Said the gigantic dragon.
"Haaa... Ok now I know for sure I'm dreaming." Said Riku as he continued backing away from the dragon.
The dragon replied: "This is no dream my duelist. Your consciousness has simply entered into your mind. And since I am now a part of you, I can simply meet with you within this place."
Riku: "A part of me?... What do you mean?"
Galaxy-Eyes: "I am a dragon that resides in the thing you call a sacred gear."
Hearing this Riku couldn't help but facepalm as he muttered: "I just had to jinx myself didn't I?!"
Riku then asked: "How... are you even here? Were you naturally part of this world already?"
Galaxy-Eyes shook his head and replied: "Not at all... in fact I followed you here."
Riku: "Followed me here?"
Galaxy-Eyes nodded and said: "Yes... right after your car accident I followed your soul here to this world."
At first Riku was confused as he said: "Followed my soul? What do you m..."
But then he suddenly thought of something as his eyes widened in surprise.
Riku: "Wait... could it be that you're my Galaxy-Eyes Photon Dragon, the yu-gi-oh card I used a lot during my previous life?"
Hearing his words Galaxy-Eyes simply nodded as he said: "That's right! Whether it be your previous life or your current life, I swore to always be your strength my duelist!"
At that moment before Riku could ask anything else, he suddenly noticed that his body had begun to turn transparent.
Riku: "W-What's happening?!"
Galaxy-Eyes: "It seems your consciousness is returning... we shall speak again we you need me my duelist."
......
When Riku opened his eyes he immediately got up and noticed that he was still on his bed.
Wiping the sweat off his forehead, he muttered: "God I hope that was just a dream... otherwise how am I gonna explain that I have some unknown dragon inside me?"
After taking a shower and putting on some fresh clothes, Riku left his room and that's when he noticed his adoptive parents Kojiro and Nami talking to none other than Serafall Leviathan herself.
Seeing this Riku suddenly felt cold sweat run down his back as he thought: "Oh no... what's she up to now?"
"Ah? Ri-chan!" Said Serafall as she raised her hand upon spotting Riku while smiling.
Turning towards their adopted son, both Kojiro and Nami also immediately smiled.
Nami: "Oh Riku why didn't you just tell us?"
Kojiro: "Yeah son did you think we would forbid you from going? We're not the type of parents that would deny you your fun you know."
"Eh? W-What are they talking about?" Thought Riku.
As for Serafall her smile grew even wider.
.....
At this moment Riku could be seen sitting within a moving luxurious looking subway train.
"Are you mad Ri-chan?" Asked Serafall while pouting.
Riku simply sighed as he stared at the train's window that seemed to show a completely different dimension then muttered: "More like... I'm just shocked at how fast everything is happening."
Right now this train that Riku is on, was passing through the dimensional border and heading straight towards the Underworld.
In short... right now Riku was literally going to hell!
This morning when Serafall was conversing with Riku's adoptive parents, she basically convinced them to let her take away Riku on a three week vacation under the belief that it was so that he could attend her Cosplay Camp.
When in truth she was actually taking him to the Underworld.
"I still can't believe she got Mom and Dad to agree to this. Just what did she bribe them with?" Thought Riku.
By this point Serafall's expression turned apologetic as she said: "Look I know it must seem extremely hasty that I did something like this even though you've only known me for less than two days... however I did explain things to you earlier right?"
"Yeah I know..." Replied Riku as he nodded and sighed.
Earlier right after Serafall convinced his parents to allow her to take him away, she quickly explained to him why she had to do this.
Firstly it was because of his Sacred Gear. Serafall states that it was a Sacred Gear that they had no information about whatsoever... and that made it quite dangerous.
'An unknown Sacred Gear that appeared on a person who had no idea how to control it.'
It was basically a recipe for an accident. Say for example if it turned out to be a Sacred Gear that was hard to control and Riku suddenly lost his temper at home. There was a chance he could unconsciously activate it and harm those near him.
The Second reason was because Serafall states that she seems to sense other types of supernatural energies within Riku's body besides his Sacred Gear.
Now as for whether these other supernatural energies were dangerous.... Serafall wasn't quite sure either.
Which is why Serafall decided to take Riku to the Underworld with her... this way she could get Riku tested to confirm what these other energies in his body were, as well as give him a bit of training on how to control his Sacred Gear.
Not to mention it was a good chance to teach him about his responsibilities as a devil under a Satan as well.
Hearing Serafall's reasons coupled with knowing what he did about the High School DxD world, Riku was convinced and decided to agree and go with Serafall to the Underworld.
Riku then showed a slight smile as he thought: "Despite everthing... I'm kinda excited. I'm about to go to a dimension that I've only seen in an anime and only read about in a novel."
After traveling for quite a bit, Riku noticed that the scenery outside the train's window suddenly changed.
"This is... a purple sky... Wait we're in the air? The train's flying?" Said Riku in shock at the sight.
As the reincarnated boy continued to stare in awe at the sight outside the window, Serafall suddenly pulled him close to her and said: "Alright we're close enough, we'll just directly teleport to my castle!"
"H-Hey..." Said Riku as a blue magic circle suddenly appeared below him and Serafall.
And with a flash of blue light, both of them instantly disappeared.
......
"This is..." Muttered Riku as he noticed that he and the female Satan were now standing in the middle of a large courtyard.
"Welcome to my private castle's courtyard Ri-chan!" Declared Serafall as she raised her pink magical wand.
"C-CASTLE?!" Shouted Riku as he turned around and saw the shockingly large castle behind them.
......
Upon entering the castle, Serafall quickly dragged Riku towards the castle's living room.
There a young man with blue eyes and slicked back green hair suddenly greeted them.
"So you're here." Said Ajuka Beelzebub.
"Welcome back Lady Leviathan." Said the maids in the room as they all bowed towards Serafall.
As for Riku he couldn't help but stare at the green haired young man in front of them as he thought: "Ajuka Beelzebub... He's here too?"
Serafall then said with a smile: "Ajuka-chan so you got here before us."
Ajuka turned towards Riku and said: "So I take it this is your long awaited Queen?"
"Yup this is my Ri-chan!" Said Serafall as she patted Riku's back.
Riku: "Um... nice meet you. I'm Riku Seijo."
Ajuka nodded and said: "Nice to meet you too. I'm Ajuka Beelzebub one of the Four Great Satans."
Serafall: "Ajuka-chan will be helping us check what those other supernatural energies in your body are Ri-chan."
Riku: "O-Oh... I see... thank you very much."
In truth Riku was still quite nervous meeting another Satan so soon, especially since this Satan was one of the few Super Devils in the Underworld.
Ajuka: "There's no need to thank me. Serafall is my good friend after all."
Serafall: "Actually I didn't really want any of those old fogeys from the Leviathan house to find out about Ri-chan yet which is why I took him here to my private castle and asked you to personally check him Ajuka-chan."
Ajuka nodded at the statement and said: "True... those old fossils can be hard to deal with sometimes."
Hearing their conversation, Riku couldn't help but think: "Eh?... So is me being Serafall's Queen something of a secret for now?"
Ajuka: "Anyway how about I start checking your Queen's current state Serafall?"
Serafall nodded then said to Riku: "Don't worry Ri-chan. All you have to do is stand still and relax. Ajuka-chan will just do a quick check on you."
"Er... ok?" Replied Riku as Ajuka approached him and raised his hand towards Riku.
Shiiing...
At that moment a green magic circle appeared on Ajuka's hand as Riku suddenly became covered by a green aura.
"U-Um..." Seeing what was happening to his body, Riku couldn't help but shudder a bit.
He was naturally still not used to the supernatural after all.
Ajuka: "Just relax at most this would do is tickle a bit."
It was then that Ajuka closed his eyes and began sensing the supernatural auras within Riku's body.
After a few moments Ajuka couldn't help but furrow his brow as Serafall suddenly asked: "How is it Ajuka-chan?.. Can you identify what these other supernatural energies in Ri-chan's body are?"
Ajuka: "Besides that unknown Sacred Gear of his, he seems to also have five supernatural bloodlines within his body... one of which seems to be related to us devils."
"Hmm... as I thought." Muttered Serafall as she remembered Riku's six purple devil wings.
"Bloodlines?..." Thought Riku as he remembered what his birth Mother said to him right after he was reborn in this world.
"You wanna know something my little bundle of joy? You actually possess five supernatural bloodlines within your body. Now aren't you special."
"I see... so Mom knew!... But... she's gone now so I can't even ask." Thought the reincarted boy as he couldn't help feel sad upon remembering his birth mother.
At that moment Ajuka suddenly showed a surprised expression as he said: "Wait... this is..."
Shiiing!
At that moment black light suddenly flashed from Riku's chest.
"What the heck?!" Shouted Riku as the black light separated from his chest and took on a form of it's own.
"Kyuu!"
Ajuka: "Interesting."
Serafall: "Waaa... So adorable!"
Riku: "It's... a little black fox?!"
Indeed the black light that came out of Riku's chest turned into a little baby black fox.
By this point the side of Riku's mouth couldn't help but twitch as he thought: "I thought I had a dragon inside me, so why did a fox suddenly come out instead?"
"Well hello there little guy." Said Serafall as she picked up the little black fox.
Little Black Fox: "Kyuu!"
Riku then turned to Ajuka and asked: "Um... Ajuka-sama do you perhaps know what this little fox that came out of me is?"
Ajuka: "Hmm... When I was inspecting your body just now, I sensed it slumbering within you. My demonic power seems to have accidentally awoken it."
Staring at the little black fox, Serafall tilted her head and said: "From the aura it's emitting I don't believe it's a type of familiar I know of."
Ajuka: "From what I could tell earlier while inspecting your Queen's body, it's connection with him seems to be somewhat similar to the pact members of the Five Principal Clans have with their Sacred Beasts."
Hearing this not only Riku but even Serafall couldn't help but be surprised.
Serafall: "Are you sure Ajuka-chan?"
Ajuka: "I'm not one hundred percent certain however your queen's connection to the little fox does feel similar to that type of pact."
Serafall then turned back to the little fox and asked: "Hey little fox can you tell me if your a type of sacred beast?"
"Kyuu?" Sounded the little fox as it simply tilted it's head looking clueless on how to answer.
"Kyuu!"
Serafall: "Ah?"
After a moment the little black fox struggled out of Serafall's hands and quickly jumped onto Riku's shoulder then licked the boy's cheek.
Looking at the small fox on his shoulder, Riku couldn't help but think: "From what Ajuka-sama said just now, it seems I have some sort of pact with this little guy... Great... now what do foxes like to eat again?"
Serafall then said: "Well since Ri-chan will be staying here for the next few weeks anyway, I'm sure we'll eventually find out more about this little black fox. Also I think it's about time I introduced Ri-chan to my other servants."
Ajuka: "Ah yes I believe they've gone to the nearby mountain to train."
Hearing this Riku thought: "Serafall's peerage huh... I wonder what they're like?"
......
A the top of a mountain a blue light flashed and Serafall's personal blue magic circle appeared.
"Well looks like our King is about to arrive with our new Queen." Said a blonde haired woman.
"Hmm... Now let's see what makes this person so special and as to why Serafall chose him to be this peerage's Queen all of a sudden." Muttered a green skinned person.
After a moment both Serafall and Riku who had the little fox on his shoulder appeared from the blue magic circle.
Feeling the cool air from the top of the mountain, Riku couldn't help but mutter: "So this is a mountain top in the the Underworld huh?... Feels nice."
It was then that Serafall suddenly said: "Oh so you guys have already gathered? Ri-chan come on I'll introduce you to the other members of my Peerage."
When Riku turned towards Serafall's direction, his jaw couldn't help but drop in shock.
The members of Serafall's peerage were ones he very much recognized.
Serafall then began to introduce the members of her peerage to Riku one by one.
Serafall: "The one in the hooded armor is my Rook Dovakin-chan... He speaks Dragon... well shouts it."
Dovakin simply bowed and said: "Nice to meet you... I have a feeling our new Queen might have the potential to learn my dragon tongue."
Serafall: "This short elderly lady is my second Rook Genkai-chan. Don't judge her by her appearance, she's actually one of the strongest fighters in the Underworld."
Staring at Riku, Genkai muttered: "Hmm... Another untrained kid... guess it's going to be my job to get him in shape."
Serafall: "This blonde beauty is my bishop Trish-chan. When it comes to using demonic power she's almost as strong as me."
Trish simply lit a cigarette and greeted: "Hey."
Serafall: "This adorable little girl that I just want to hug so much is my second Bishop Natsuki-chan! Her circumstances are a bit complicated but beings from the supernatural side usually know her as the 'Witch of the Void'."
"Hmm... That little fox on the boy's shoulder is definitely no ordinary familiar." Thought Natsuki.
Serafall: "This weird messy haired blonde guy is my Knight Kisuke-chan. He may look like a perverted uncle, but he's actually someone who's almost as smart as Ajuka-chan. So don't underestimate him."
Kisuke: "That's so mean Sera-sama... I don't look like a perverted uncle at all."
Serafall: "The green skinned man over there is one of my Pawns Piccolo... I call him Pico-chan!"
Piccolo: "It would really be nice if you stopped calling me that."
As if not caring about Piccolo's complaint, Serafall continued her words: "He's a Yokai. Well... an extraterrestrial Yokai."
Serafall then walked over to what looked like an ice cage and pointed towards the person inside it.
It was a man with long silver hair and one black angel wing.
Serafall: "This is my second knight Sephi-chan... He's a former fallen angel."
"My name is Sephiroth." Said the silver haired man.
Serafall: "If you're wondering why he's in an ice cage, it's because he's been a bad boy lately so I decided to put him in timeout."
Serafall then turned to Riku and said: "Anyway for the next three weeks the seven of them will be your personal teachers Ri-chan. Besides helping you control your Sacred Gear, I'm sure they'll be able to teach you many other things as well... So try to get along ok?♡"
The seven members of Serafall's peerage then started looking at Riku as if they had just found a new toy.
Seeing their gazes, Riku couldn't help but think: "Heaven help me.... Oh who am I kidding I'm literally in hell already!"
"Kyuu." Sounded the little black fox as it shuddered upon feeling Riku's slight fear and nervousness.
It was at this moment that Riku's training in hell began.