弗兰德斯，西班牙王国，1616年。小镇布姆的居民正忙于筹备一年一度的本地庆典，突然传来消息：代表西班牙国王菲利普三世统治该国的奥利瓦雷斯公爵即将到访。当男性市民怯懦地陷入恐慌时，勇敢的女性市民决定成为西班牙人前所未见的完美东道主。（1935年法国电影《英雄的狂欢节》德语版）

During World War I, in Flanders, Berry and Morley were in love with the same girl, Yvonne. During a battle in the Widow's Island sector, Morley is wounded and abandoned by Berry. Morley being reported missing, Berry now has a clear path to marry Yvonne.

Released in France as La Kermesse Heroique, Carnival in Flanders is set during the long-ago war between the Dutch and Spanish. A tiny village in Flanders is invaded by Spanish troops. The townsfolk have heard of Spanish cruelties in other towns, and decide to deflect the vanquishers by playing dead. This isn't terribly effective (you have to take a breath once in a while), so the wife of the burgomaster tries to soften up the invaders with a lavish carnival. So successful is this venture that the Spaniards allow the village to escape being decimated, or even taxed. An award-winner many times over, Carnival in Flanders was banned in Germany; evidently, Goebbels caught on that director Jacques Feyder and scenarists Bernard Zimmer and Charles Spaak were drawing deliberate parallels between the Spanish and the then-burgeoning Nazis.

三个大学朋友不满于当前的社交处境，决定到新奥尔良参加嘉年华会，并且找到答案。一连串的派对、疯狂酒精，将引发一连串失控轶事。

主角是一个只知道自己的名字和“嘉禄”，有点不可思议的少年‧无。正当他以嘉禄留下的腕轮作为唯一线索，出发展开寻人之旅的途中，被一位名为花砾的少年所救。花砾向无索取腕轮作为报酬，两人因缘际会地一起行动，却意外地被卷入火车劫持事件里，并因此和国家防卫机关“轮”有所交集。无在和众人的相遇中学习了各式各样的新事物，对花砾而言，这也替他揭开了一个前所未知的新世界──以“嘉禄”、“腕轮”、“轮”、“能力者”、“火不火”作为关键字，色彩绚丽有如狂欢节的《狂欢节》，就从这里隆重开幕！

小海帮家里把装饰花卉运送到城市里的露营场地，这里即将要举办一个商业快闪市集。在这个被搭建起来的乐园里，他偶遇了前来准备演出的高中同学小丽，并一同离开营地去到附近的一个商场玩乐，打发这个无所事事的午后。