This Japan Series, which decides the pinnacle of professional baseball, is an important phase.
The first female professional baseball player, Kusabuki Megumi, takes the mound. She is so talented that she is the ace of the Little League team among the boys. She chases down a hard-armed male hitter with her mysterious pitch, but what about her left hand?
This is a human sports drama that confronts women's baseball with all its might

Note: The phrase "(go for) all the marbles" means "to give it a shot" or "to put everything on the line".