In the mid-70s, a rising boxing star was cut down in his prime, before he could achieve his dream of becoming a world champion. His children, Ryuuji and Kiku, have inherited his boxing talent, and set out with the intent to fufill his wish. With Kiku as the brains and Ryuuji as the brawn, they'll work their way up from the bottom to one day take on the entire boxing world!