Following the events of Operation Castle and the tragic fate of the Daigo Fukuryuu Maru crew, an anime unfolds where a hydrogen bomb explosion on March 1st, 1954, parallels the devastation of Hiroshima. As radioactive ash descends upon the sailors, a fantasy twist emerges when the marine life, impacted by the ash, gains the ability to speak and don human attire. The narrative centers on the repercussions of the radioactive fallout, particularly focusing on the curious phenomenon of talking fish and their altered existence.