"High school Dxd : the strongest one."

Back story:

Ok i dont have a firts chapter yet but this is a little of the back story i came up for now, i will make more parts of the back story to clearify some things that will be part of the story line... and for the song of untop... is beacuse i love the damn song XD... play it when you read this back story to make it  less boring (UnU)... ok thats all .

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Old lady voice:

From the era of the great war against the 3 factions; Angels, fallen angels and devils. The war was on his limits of massacre and corpses everywhere but in the middle of this was the most affective by this immense battle were the humankind, they were in the middle of the heave fire of light spears, dark spells of destruction, and more than, but in that middle of this war, there was a simple human who believe in the words of god as much as he could in other to be save by him and for the sake of his family... but after of hours of pray, his hope die when he saw his friends, his home, his people, his father, mother, brother and little sister... die because of this war that was being continue in this lands of humanity. This place supposed to be for the humankind to live in peace, but after this... the young one knows now that humankind was never importing for god the supposed to be their protector, the boy now was in total anger, hate, sorrow, pain of finding the truth of that every praise he did in for god... was in vain... but in that same moment of chaos the young one has starting to want to fight back against them, in other to finish this excuse of wish for power and lands. To finish the ones that have invade his home and star a war that supposed to be between them and not humanity, unknown to the devil's, angels, fallen angels, God and Lord of hell (real Devil) the boy was granted an immense power; the strength of the world... no... the power of all the living life of earth and universe, all that was possible because the same planet, the same people that have suffer their end on this battle as well all the life that was in danger wanted that this war ends.

Once the young one have obtain this immense power, he end the war by killing the some part of angels, devils and fallen angels. But what really end this war was that the same mighty young human that kill God and the lord of hell itself. With his bare hands he kill both of them, showing his tremendous power that was up everything that they have ever seen before. Even the dragons have fear of this human, they saw his power and how he almost killing them all.

In other to survive and prevent their extinction, the 3 facts have sent their superiors to talk to the powerful young one and make a peace treaty, in the beginning the young human was going to kill them without doubt it but they offer to the human they loyalty with a covenant write with by their own blood (that's right blood of the 3) the same covenant was one of the great's offer a devil, angel and fallen angel could have offer. If the human accepts the offer he will be the new leader and lord of this 3 factions and the ruler of the planet but as well the 3 factions will have their own superior's lords in other to represent their kind. The young one make the decision and ask for one more condition on this peace treaty.

Human: I will accept this offer but with one more condition.

The 3 look at the young one with fear of what could be.

Human: I want that no one knows of me, only the 3 of you will keep this to yourselves, you will not be allow to say about me to your children unless I want them to know, I will not accept of you slavering my people and treat them with cruelty unless they deserve it. Or you will suffer my wrath in your precious lands of hell and heaven... do I make myself clear.

The 3 were grateful that he accept the peace treaty.

As soon the time pass the one who know the ultimate human have starting to get to old to be in this world, as for the ultimate human, he was growing in a different way... or not, is like he got eternal youth. He stills look at his 15 but he was more than 100 years and the 3 individuals that know him are starting to get worry of the conditions that they are, they were getting weak, lost, and afraid of him... so they come with a guess to the strong human. But this time only the represent of the devils and angels appear this time, they both offer the strong human a favor to help him up with his problem, they offer help on guarding the humankind of any treat, the human didn't like the idea of them helping him, but he knows that one day he will may die and no longer be there for his people, so he accept but with 2 conditions that are also a benefits for the 3 of them, he ask for them to only to send a represent of each family to the human world until is they see its necessary, and that they will let him live in pace or it will be the last thing they will do, you would wondering why the last one its beneficent them as well... to clear your question, he also agree on not interfere with the devils personal problems unless this concerns him with a good reason. But the most importing think was he is the one above any one of them, he was the lord of the 3 factions and the protector of the planet. So his words are law to them, as the time pass the strongest human became a lost and forgetting legend, but for some specific individual's he is still out there, ready to fight against whoever treats humankind to its end. But others say he die long ago as like they were just rumors of this mightiest mortal that kill god itself.

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But...

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How says he is just a legend...

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When his stills a lord on everything...

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But also the only one....

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That can fight against...

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The destroyer of lives...

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He will rise ones more...

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To prevent the end of us and his people.

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By sacrificing his own life in the greatest and last battle of his life.