Chapter.1: The musician

When a monstrous demon escaped the underworld, the earth and all of humanity was doomed...until a goddess emerged, sealing the demon away with her power of song, but she was left weak, having to return to the spirit world. But despite being sealed, the demon's very presence slowly poisoned the earth, so the goddess blessed a family to give birth a beautiful singer that would be given the voice to sing "The song of Prosperity" to reset and cleanse the earth of the demon's poison.
After 50 years of peace however...the demon's seal was finally breaking...