Koharu and Hiyori became "sisters" due to their parents' remarriage. They enjoy night relay fishing and are planning a tuna fishing trip for their school trip to Okinawa, making their second year of fishing life a great success! Meanwhile, their friends Futaba and Aiko, who became friends through fishing, are now in 6th grade and are at an age where they are troubled about their future and career paths…? The 8th volume of the girls' story connected by fishing lines!