在电视剧《萤之光2》的最后，小萤和部长可喜可贺步入婚姻殿堂，干物女的恋爱迎来幸福结局，但是……
电影的舞台在意大利罗马，两人蜜月旅行来到这里，遇到了意大利版干物女冴木莉央（松雪泰子饰）和她的弟弟优（手越祐也饰），引起了前所未有的大骚动！
在罗马，为了追寻失去联络的新郎高野部长，在街头狂奔的新娘小萤的命运会如何？
两人能在意大利得到永恒的爱吗？

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