A girl challenges professional fly fisher Atsushi Kitayama, who has been catching char one after another in mountain streams. The girl's name is Iwana Ayuhara. Pro Kitayama is angry at Iwana's provocative attitude and decides to accept the challenge! The rules are to compete to see who can catch the most in one hour, and the winner gets to use the fly from the loser. Iwana is not only good at fishing, but also has a good fishing technique, catching char one after another, but Pro Kitayama, who is also known as the "Dry Fly Magician," has a sure-fire technique for catching fish: "ultra-fast casting"! This is a full-fledged fly fishing comic that depicts Iwana's travels in search of his grandfather, Keiichiro Ayuhara, a legendary fly fisherman who was called the "father of Japanese fly fishing" and won consecutive fly fishing competitions overseas, and his fishing showdowns with fishing masters from all over the country!