Claudia is a young woman who lives independently and works at a supermarket. One fateful night, she awakens to extreme abdominal pain caused by appendicitis and decides to check herself into the hospital. In the adjacent bed, she meets Martha, an older woman receiving care from her children: the eldest, Alejandra "Ale," the second oldest, Wendy, along with school-aged Mariana and Armando. A bond quickly forms between Claudia and Martha as they engage in conversation.
Upon their joint discharge from the hospital, Martha insists on taking Claudia to their home for her recovery following the appendectomy. Claudia shares dinner with the family, but the evening takes a turn when Wendy has to assist Martha to the bathroom, where she suddenly becomes ill. Consequently, Wendy and Ale take Martha back to the hospital, locking the door, leaving Claudia unexpectedly stranded for the night.
In the morning, Claudia takes on the responsibility of getting Mariana and Armando to school since both Wendy and Ale are unavailable. This act helps her connect further with the children. Later, Ale drives them to the hospital, where it dawns on Claudia that Martha is battling AIDS. Agreeing to stay with Martha that night while the others attend to prior engagements, Claudia opens up about her own family. When Martha inquires about her parents, Claudia describes her mother as exceedingly frugal and her father as distant.
As the days pass, Martha reminisces about her children's fathers, revealing that the man who infected her, a figure named Armando, is also the father to Mariana and Armando. Though she experienced anger towards him, Martha chose to remain by his side until his passing.
Amid caring for Martha, Claudia surprises Armando with a pet catfish. During a heartfelt conversation, she confides in Martha that her own father is a mystery to her and that she lost her mother at the tender age of two, leading to her solitude.
Sadly, Martha's health deteriorates, prompting the family to fulfill her wish for a beach getaway. However, during one particular dinner while on vacation, Martha's condition worsens significantly, resulting in a frantic rush to the hospital. While the rest of the family accompanies Martha inside, Claudia stands outside, contemplating her situation before ultimately gathering her belongings, including the fish tank, and walking away.
In a poignant aftermath of Martha's passing, Claudia and the family take a drive through the city, where they scatter Martha's ashes. The film culminates with Martha's voice echoing her heartfelt final words directed towards her children and Claudia, leaving a lasting impact.
