小林多喜二のプロレタリア小説『蟹工船』のSF版で、海が蒸発し、水生生物が飛行種に進化した架空の未来を舞台に、若い漁師、龍介を追っていきます。A sci-fi version of Kobayashi Takijis proletarian novel Kanikōsen, in which we follow the young fisherman Ryusuke, in a fictional future where the sea is evaporating and aquatic creatures have evolved into flying species.