A young man named Rion wakes up in a hospital. He does not know who he is, he can hear a girl's voice in his mind, imploring him to save her. While trying to escape from the hospital, Rion is detained by guards, and discovers that he possesses devastating psychic powers. Trying to understand what has been done to him, Rion gradually uncovers the mystery behind the "G Project", a human experiment that involves unlocking the hidden potential of the human mind.