Long ago, the people were given knowledge by the Goddess, and civilization flourished. They built towers stretching toward the heavens, and a weapon so powerful, they could pierce the gods themselves. However, that civilization was decimated shortly after a violent conflict between the Goddess and the Vile God. Ages have passed since then. Our story begins with a young man named Fang who had become a Fencer, a swordsman who has the ability to wield a special weapon imbued with a Fairy known as a Fury. Along with his companions, Fang is on a journey to find the Furies, and resurrect the Goddess. One day, he encounters a woman who can save people with her song, and another who can brainwash people with her song. Along with the mysterious power of the women who call themselves Muses, Fang's destiny begins to unfold...

Shukugawa Meguri is afflicted with an illness called the “Oumon” disease. At this point in time, nobody knows its cause, and there’s no real treatment for it yet. The only option with a slight chance of success, is to undergo a heart transplant. But finding a compatible heart is something that can be compared with a miracle. For that purpose Meguri’s sister, Ria, was actually born as a designer baby. So that her heart could be used “like a spare”. This is the story about two sisters, the youngest born for the sake of the eldest. Other than their family, only Meguri's best friend Ryuuji knows about their secret. Her resolve wavers during the little time they have left. What will be the conclusion at the end of these emotional moments?