The main character is a young general named Yamanouchi Kagetora , who is intent on avenging his father 's death by reviving the most ingenious weapon ever to hit the medieval battlefield : the Odama .
The main character is a young general named Yamanouchi Kagetora . 
 Kagetora is intent on avenging his father 's death by reviving the most ingenious weapon ever to hit the medieval battlefield : the Odama .