Prodigious (Who am I?) (Gusion's Story)

The story of a boy named Gusion who had a happy family but was ruined by a group of criminals. He decided to find these criminals who killed his parents and abducted his sister and brother. While in search of those criminals he will meet someone who holds the truth about his past and who he really is that will change his life forever. Along the way to find those criminals he joined a group of magical assassins called "Twilight Phantom". Then he will discover a world he never knew exists.