De Idylle weaves together the stories of several generations of a dysfunctional family, each on a quest for personal fulfillment. The film begins with a surreal scene of a concrete ostrich being flown over a European city, setting the tone for the film’s exploration of life's unpredictability. A middle-aged man, after recently coming out as gay, struggles to navigate the dating world. His opera singer sister, facing a terminal diagnosis, reflects on her life choices and missed opportunities. Their grandmother, tired of life, seeks a peaceful end but is denied assistance. Meanwhile, a 10-year-old boy, told by a fortune teller that he will die in seven days, embarks on a mission to fulfill his bucket list. As these characters' lives intersect, De Idylle explores the randomness of existence, as each individual comes to terms with their fate, seeking meaning in the face of mortality.
After the death of his wife, pig farmer Ronald is responsible for the care of their daughter and the farm. The ever stricter environmental requirements hang around his neck like a millstone. When, to make matters worse, animal activist Erik, unaware of Ronald's situation, starts an ever stronger hate campaign against him, Ronald is desperate.
During the annual family weekend in theme park "De Efteling", eleven-year-old Teun discovers that his recently deceased grandfather left him one last scavenger hunt inside the park.