Living as the Youngest Princes

From a long time ago, in a country called Sora. There has been a prophecy that was said to bring fortune in the Kingdom of Nyphylia. "In the darkest night of the year. A pair of twins will be born. One will possess the power of light while the other will receive the power of the night. An unavoidable danger will befall to this Kingdom. And nothing can stop it but the power from above." The King and all of his subjects was surprised. Some were afraid while others were ecstatic. The whole Kingdom rejoiced. However, even from before the prophecy was told. The royal lineage has never been blessed with a pair of twins. With this thought in mind, the King announced that he will pay every woman who would let themselves be impregnated by him and his family. However, that woman should bring proof, proof that her family have produced a pair of twins, no matter what generation. They tried and tried. For tens and hundreds of years, they tried. Until 253 years later: "Uwaahh!! Uwaahh!!" the loud cries of two newborn babies rang inside the Queen's chamber. However... "The Doctor!! Call the Royal Doctor!!" The Head Maid loudly shouted as she carried the twins away from their mother. "The Queen stopped breathing!!!" The beings that was believed to bring fortune to the Kingdom of Nyphylia.... Caused a great misfortune on the day they were born.