The world will be saved. If we lose her. The world ofSylvaranthas been plagued by mana exploitation and calamity byDesians, an evil group supposedly sealed off by the hero, Mithos, 4,000 years ago. Colette, the daughter of an angel, receives an oracle and sets out on a journey for the rebirth of the world with her childhood friend, a boy named Lloyd. If she is reincarnated as an "angel," this world will be saved... Believing this, Lloyd and his friends take on numerous challenges. However, the rebirth ofSylvarantmeant the decline of the inverse world ofTethe'alla, which is inextricably linked to it. For one to prosper, the ther must be sacrificed. Is this inevitable...? This feeling overlaps with that of Colette, who gradually loses her humanity as she gets closer to the "angel"...