仓下月海（花泽香菜 饰）是个不折不扣的宅女。而她的主攻方向还是颇为冷门的水母。梦想成为插画家的月海来到了东京，住进了女生宿舍天水馆。天水馆里面住的全部是宅女，她们各有各的萌点和爱好。管理员千绘子（齐藤贵美子 饰）喜欢做人偶；玛雅雅（冈村明美 饰）则是个三国爱好者；邦巴则 热衷铁道；吉吉（能登麻美子 饰）则是中老年男性控……天水馆成了她们的小家和小天堂。而另一边鯉淵蔵之介（斋藤弥月 饰）则出身名门，但不想继承家业的他，以女装打扮，梦想成为服装设计师。宅女和伪娘的故事就此拉开了序幕…… 本作改编自东村明子的同名漫画。该漫画曾获得2010年第34届讲谈社漫画赏少女部门赏。
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