In the futuristic setting of Onomichi, Hiroshima in the year 20XX, a mysterious disappearance of fish from the oceans leaves only whales swimming in the sea. To address this crisis, the Ministry of Fishery embarks on a bold initiative by launching massive experimental Universe Fish Tanks in space. This leads to the formation of the Onomichi Universe Fishery Union, dedicated to training space fishermen for this unprecedented task. With the implementation of gender equality laws, there is a surge in demand for female fishermen, leading to the selection of six new aspiring women entering the ranks of space fishermen. The narrative unfolds as it follows these six determined female space fishermen on their journey of growth and development in this challenging and unique profession.