Marine scientist Fred Miller designs the world's first underwater home, but when the business magnate funding his work threatens to end the project, Miller volunteers to live in it with his own family to prove it's practical. The underwater clan includes his water-phobic wife and his daughter and son, who are part of a rock and roll band. They bring along the lead singer and drummer. Along the way, they have to contend with a competing engineer who promises to mine the ocean floor for the businessman. A record producer likes their music and books them on TV, leading the kids to try to escape to the surface.。居住在东京下町父母双亡的四月一日家的三姐妹四月一日一花、二叶、三树。母亲在她们幼小时去世。父亲也在去年去世,姐妹三人居住在父亲留给她们的独立家屋中。某日 、结婚后的二叶离开娘家,开始和一花、三树一起生活,这样的四月一日家中到来了带着某个目的的神秘女高中生 (物述有栖)另一方面,搬家的二叶在卡拉OK吧「雅子」开始打工。在卡拉OK吧中老板娘的女儿・大森神生湖(天神子兔音)和酒屋的女服务生・若木春(夏色祭),打工同事的演员少女·山村忍(大空昂),三姐妹的表妹姐雨夜瑠美(朝之瑠璃)等充满个性的成员和四月一日三姐妹+借住陷入了大混乱……。赴职的李安在碧波湖畔被余县贪官授意的恶霸杀害,红鱼未能及时搭救,只能将他藏在碧波洞里,而自己为寻找真凶扮作李安为官,凭借智慧连破奸人诡计,震慑奸佞。后来,红鱼因为无法面对李安的母亲和满腔痴情的赵秀,毅然舍弃三片金鳞,救活李安。复活后的李安雷厉风行,有红鱼相助,如虎添翼,二人联手为查明要案和余县的贪官、恶霸、土匪连番斗智斗勇,并最终除暴安良,保一方平安。。