An amateur documentary on the San Fermín festivities in Pamplona. The film begins by capturing the atmosphere of the city on 6 July, the eve of San Fermín Day, through the chupinazo in the Plaza Consistorial and the riau-riau. It continues with scenes from a full day of the San Fermín festivities on 7 July, divided into three parts: morning, afternoon and evening. The documentary pays particular attention to two very characteristic aspects of the festivities: the colour red, the symbol and dominant colour motif, and the bustling atmosphere of the celebrations. The documentary ends with footage of the city once the festivities have ended.