Hana and Petr are a long-term couple whose stable relationship has settled into a stagnant routine. Desperate to revive the spark, Hana convinces Petr to open up their marriage to extramarital affairs under a strict rule of radical honesty, agreeing to document their encounters on their smartphones. However, the experiment quickly spirals out of control. As Hana thrives in her newfound sexual freedom, Petr suppresses an agonizing jealousy, engaging in his own reckless hookups to keep pace. When their digital archive of videos is destroyed, the transparency they prided themselves on mutates into a toxic psychological weapon, turning their quest for liberation into a destructive power struggle.