年近不惑的永里大介（香取慎吾 饰）在东京一家文具公司工作，他贷款终于在闹市中央一栋高级公寓买了属于自己的房子。拥有诸多高雅爱好的他致力于将这里打造成属于自己的城堡，既不想接纳疏远的父亲，更别提恼人的爱情和聒噪的同事。事与愿违，他的楼上住着某企业时尚单身女性熊谷叶菜子（上野树里 饰），经常一根筋给永里公司的产品提意见的叶菜子，注定和这位邻居关系不睦。雪上加霜的是，永里的父亲阳三（西田敏行 饰）居然还带着续弦妻子的儿子自顾自住了进来。梦幻城堡垮塌，永里盛怒之下不得不别别扭扭和“入侵者们”相处度日。 他能否夺回属于自己的完美人生？Nagasato Daisuke is a 39-year old bachelor with an extremely negative attitude towards marriage. However, he truly believes that he'd "rather be alone." Averse to taking the risk of bringing in other people into his living space, he protects it as if it was his castle, and is fully enjoying his idiosyncratic single life. Kumagai Hanako, on the other hand, is a 32-year old divorcee who works for a major trading firm. She has her own distinct thoughts about being single, doesn't want to get married again, and already planning for her life after retirement. When these two meet, they fight constantly, but they're actually similar in a lot ways.
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