Within a certain household, young boy who had bright burning atmosphere around him having a wild brown hair like lion mane and brown eyes that was excitement as the day goes as the moment when he would turn 5 years old and couldn't stay put as he humming playing with her toys and soon felt someone wrapped their arms around him then heard his mother's voice and said.
[ Image here ]
"Issei, are you excited for your 5th birthday?" Issei Hyoudou, formerly known as Hiroto Hyoudou, is currently about to regain his memories of the past and gain everything that the Herrscher gifted him. In the past 5 years, despite having no memories for his adult life was an extremely gifted child so full of curiosity that he began speaking within a month, shocking his parents yet didn't treat him any differently and show him even more love.
He was a bright child and was constantly learning that he was able to walk in 4 months and able to read and write within a few days. At one year old, he already reached highschool level of information and was able to memorize an entire book in single glances. His parents were a bit worried about his genius level intellect but didn't show their thoughts worried that they're son might think that he was some kind of monster due to his intellect.
Though, they didn't have to worry as he was not just a genius but a social and outgoing child that acted his age despite his intellect. At the age 2 wrote an entire research thesis in programming, scientific theories, Anti-matter theory, Etc. The child had many discoveries that could have tipped the world but he was mature enough that he didn't publicize them and merely wrote them in his room.
He built many intricate machinery made from a file of trash and built small nanites along with artificial intelligence by using said nanites to upgrade his machinery. Most of his invention was illogical and was working beyond the fundamentals that even if someone learned of his creation then none would be able to replicate it as only the young boy knows its secrets.
At the age 3, he created a company with an alias having carefully planned everything and resulted in building a multi million company within the age of 4 where between those times upgraded his family electricity to an recycled and infinite source of energy called Arc reactor. His skills and technology allowed him to acquire information that isn't public to the people due to his hunger for knowledge and learning about the supernatural which made him reconsider his plans on how to protect his family.
This results in building a defensive system in his home that can at least combat and protect his family. He kept it a secret but eventually had to tell them and help his family have a way to defend themselves knowing he won't always be there to protect them. The young boy, Issei had been studying every forms of magics even how milicule it was eventually gain a psionic ability that became useful in creating more machine and use his knowledge to manipulate matter building even more stupidly broken invention.
He didn't try to contact any devils nor get into the supernatural since he understood how dangerous it was and kept his investigation at bay.
On the other hand, the young boy despite his cute appearances had a rather toned body as if built to fight and had been learning how to fight by observing and training that he was basically a prodigy in fight and he uses those skills defending and helping people when he can. The young boy was well liked by his peers in the daycare as he often protected the weak and taught others but never entitled himself to his intellect that even the daycare teacher smiled at him. He was a genius yet still had child qualities. Issei giggled being embraced by his mother and said.
"I am! I'm really really really excited!!" His mother smiled as another voice came and ruffled his hair and said.
"Hahahah, my boy is growing closer to becoming a man!!" His father bellowing laughter echoed as they began preparing for his birthday party and soon enough his friends from the daycare arrives began playing in their backyard running around while their parent were chatting until everyone was gathered to sing Issei a happy birthday and the moment he blew his candle was the moment his previous memories began flooding into his mind along with the power of the Human Science God making him tear up recalling his life and his parent immediately saw this asking what was wrong but he quickly wipe his tears and told them he was just happy that's all.
They smiled when they heard it and didn't think too much before enjoying their time with the party where they opened gifts while Issei giggled and acted normal, not letting the memories remove the enjoyment of his new life. He regains every detail of his and life fusion him into his current life. This young boy was both Issei Hyoudou and Hiroto Cinco and he didn't view his current parents as strangers and had a deep familial love for them. When the party's finished and Issei was about to go to bed, he decided to visit his pocket dimension that had the megastructure but before that he wanted to test something and said.
"Open system."
[ Opening System. ]
[ Unlocking Sacred Gear ]
[ You have acquired Longinus Sacred Gear: The Boosted Gear ]
Issei amazed from everything that he was gaining then halted his thoughts when he heard the mention of a sacred gear and among the things that he had research, he had been interested in learning on creating his own sacred gear but was too cautious to even try and venture to find sacred gear user, hence, he didn't have any much data beside searching using his nanites that connect to his laptop.
He did create numerous modern technologies that made his company a multi-billion company that branched from machine to record company. It was basically Disney from how vast it had become and how relying people become. Many tried to find who he was but none succeeded and kept his identity a secret having a person under him act as the CEO. No one would believe them that a 5 year old owns such a massive company but logic does not apply to him.
[ How interesting. This is the first time I've been able to communicate with a host immediately after being activated. Hmmm? What is this… ] He heard a regal and tough voice of a woman coming from his mind. Issei was a bit taken aback but his Intuition and deduction knew that the voice came from the sacred gear. The data he gathered pointed out that gods often seal powerful beings into an artifact called Sacred gear and the strongest are the Longinus Sacred capable of killing a god. Issei doubted killing a god was possible but research needed to be conducted. Soon enough, the voice returned and said.
[ I see, things are different than I thought. Entities beyond even Great red and Ophis…This will be truly interesting.] The voice commented while Issei decided to speak and said.
'Excuse me but who are you? And how come you're able to talk in my head? Based on my investigation and research, you would be Ddraig, the heavenly dragon of domination?' The voice seemed to laugh amused from his rapid question and said.
[ Indeed, I am Y Ddraig Goch, Red Dragon Of Domination. I've had many hosts before and none had the same potential as you, perhaps you'll be the one to end my rivalry with Albion. ]
Issei heard her words and was amazed that he had one of the strongest sacred gear capable of Infinitely increasing the power that from his estimate should multiply it from the previous number. Like 2, 4, 8, 16, etc. and multiply it to his base power and you have an extremely powerful entity capable of shaking the entire world. Issei nodded and said.
'Is that so? Well, it's nice to meet you, Miss Ddraig. I'm Issei Hyoudou, previously known as Hiroto Cinco. Hope you take care of me from now on and in exchange I'll do the same.' His words made Draig interested and drawn to the young boy and said.
[ Miss Ddraig? The name is just title given to me by the humans, feel free to name me if you wish. ]
[ A/N: Give me some names. Also should I gender bend Vali for him hahahaha ]