Marteinn has just moved in with his girlfriend, Elísabet. While they try to settle into their new domestic life, Marteinn's eccentric best friend, Lárus Páll, immediately begins to intrude on their privacy. Tensions rise when a bet is made regarding the couple's future and their ability to handle the new living arrangements.
As the couple tries to organize their apartment, a turf war breaks out. Marteinn struggles to establish his own space within the home, while Lárus Páll refuses to respect boundaries, treating their new home as his own personal territory.
A misunderstanding leads to chaos when Lárus Páll convinces Marteinn to join him on a questionable adventure. Meanwhile, Elísabet tries to maintain order at home, but her patience is tested by the boys' immaturity.
Marteinn falls ill (or feigns illness) to get out of a commitment, but the plan backfires. Elísabet tries to be sympathetic, but Lárus Páll's attempts to "nurse" his friend back to health only make matters significantly worse.
Insecurities surface as the group discusses fitness and health. Marteinn becomes obsessed with his weight after a casual comment, leading to a disastrous attempt at a new diet and exercise regime orchestrated by Lárus.
The couple attempts to spark some romance and intimacy in their relationship, but their plans for a private evening are repeatedly thwarted by interruptions, misunderstandings, and the ever-present Lárus Páll.
A costume party or theatrical event causes confusion. Lárus Páll lands a role that he takes too seriously, while Marteinn and Elísabet are forced to deal with the social fallout of his behavior.
Overwhelmed by household chores, the couple considers hiring help. Lárus Páll offers his "services" to save them money, resulting in total chaos and a final test of Elísabet's patience with Marteinn's choice of friends.