Deep in the vast Cyber Forest, there is a holy mountain, which is the most mysterious place in the Forest. It is said that there is eternity hidden there, which is the origin of life. The foot of the holy mountain is filled with colorful fog all day long, which has never dissipated for thousands of years. People call it Misty Forest. The Harpy Amelia Hartmann lives here and seems to be guarding something. She is a nightmare for all creatures who step into the Misty Forest. Few survivors have survived from the Misty Forest in ancient times. All survivors lose their memory of what happened in the forest. The only thing they remember is the whisper "Tanya charybdis." that keeps ringing in their ears, This Notes with unclear meaning has become a nightmare through the rest of their whole life.