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Backstory of the events taking place before Saint Seiya.
The manga's story begins when a new threat arises while Athena's warriors are busy fighting Hades. To combat the new threat, Poseidon, the emperor of the sea, awakens.
The story recounts the birth of Saga and Kanon until the time of Saga's suicide before Saori in the defeat of the Battle of the Twelve Houses.
High school student Amatsuki Iori was summoned to a different world to fight as a brave of salvation, but whilst he was trying to save the world, he ends up being killed by the companions whom he wholeheartly believed in. It was then, when Iori thought that he already died, he came to his senses only to find that he was re-summoned to the same world, but in the future. Back again as a brave to subjugate the demon king which his former self had failed to defeat previously… Then, he noticed, that among the guys who ordered him to fight as a brave, the figure of one of his former comrades could be seen. 「……I will make you regret having betrayed me.」 A girl then appears before him as he is consumed by hatred, but not any ordinary girl – she is the former demon king who is also aiming to take revenge. The brave man who abandoned his heroic ideals, exchanging them for a burning desire to take revenge and the former demon king who seems ready to join him in his new-found quest.
Ten years have passed since four boys and girls were summoned from another world and defeated the Demon King. Arsal, a former hero who saved the kingdom and now serves in the royal army, finds himself falsely accused of a crime he didn’t commit. The king, blinded by peacetime complacency, ignores Arsal’s calm reasoning and mocks him as a useless burden, completely forgetting his heroic deeds. Fed up with such foolishness, Arsal abandons the kingdom, grabs his severance pay, and sets off on a carefree journey to enjoy a slow life. However, his overwhelming power makes the world see him as a dangerous threat aiming for world domination!? “Fine then — extinction it is.” Thus begins the tale of a betrayed former hero who will make this foolish world understand his worth — the start of a savage, retribution-filled brave story!
Sky Vincent was born in a world where people are judged on magic rather than the quality of their character. So it was inevitable that when his first magic testing came in and he had the weakest magic power available, he was immediately disgraced by his family. Walking in the forest, he met a wandering mage who informed him of the secret of his power - while his magic is minuscule, as it is the <<Null>> element, it can negate other types of magic. However, while his magic isn’t suitable for a few slow massive attacks, it is perfect for a hundred quick little ones. Can Sky train up his magic so he can go from a laughingstock to the most powerful wizard in the world with a harem at his knees? (Note: he totally will because look at the cover he has fricking guns, just act surprised when it actually happens)
Jin reincarnates into the most hated and worst character in the game he played before he died. If the same scenario is followed, he will fall into darkness after three years. ...... In an attempt to avoid such a fate, Jin begins a life as an adventurer--?
Arquas is a man who lives only for his hobbies and training. He has been content with his modest life as a bronze-rank adventurer, the lowest-class. One day, however, the goddess of creation, Willas, suddenly appears in his home and offers him a job—to become the Demon King and stand in the way of the strongest demon king's army in history. The only compensation offered is minimum wage, but even so, Arquas accepts the job.
The old man who matches the number is actually a legendary adventurer! The strongest training fantasy from becoming a novelist!!
Having been assigned by the human elders the mission of stopping a mystical plague that has afflicted the Youkai with madness, Genjyo Sanzo assembles his team of Youkai warriors, desperately hoping that the disease will not affect them. He sets up qualifying tests that will help him determine the loyalty and worth of Cho Hakkai, Son Goku and Sha Gojyo. The team then journeys west to rid the land of madness.
