One stormy night, Kensuto Kanzaki is murdered by agents of a secret Rukian sect, 
Overture. One year later, a cryptic letter - written by Kensuto - surfaces, appearing to have clues to the location of his research on a powerful artifact.
Former Intelligence agent, Dr. Hayama Ryu - with the help of Kensuto's son, Kounosuke, lead their own operation to follow the trail where Ken left off...