Flowers and Storms

(from ebookjapan):

Junya Shiratori is a high school student who devotes his youth to karate. One day, he learns that his father, a photographer and respected man, was killed by American soldiers' gunfire during the Vietnam War.

As his anger toward the American soldiers grows, his karate club decides to hold a rivalry match against the American School!

Junya is furious and beats up his opponents one after another...