OMEN : Beware of your future

Fuse, a knight with a prowess for fighting is brought inside a world he isn't used to by a young girl, his destiny was to be trained by her to fight on the great magic apocalypse where all knights and magicians collide, but, not only is she a magician, but she also knows the future! Why did she decide to train him, is this encounter a good omen or should he beware of his future.