Asterix, Obelix, and Dogmatix inadvertently get caught up in yet another adventure: White Iris is the name of a new school of positive thinking, originating from Rome. Like all trends, it begins to spread. Caesar, in his attempt to conquer the notorious Gallic village, decides that this method could have a beneficial effect on his soldiers, weary from the constant beatings, and thus sends the life coach, Laoplanus, to teach it to them! However, it soon escapes the confines of the Roman camps and starts to influence everyone who comes into contact with it…