Gael and the rest of the Coterie help Jazmin plan a big celebration-a "Doble Quince"-to celebrate her 30th birthday and the Quinceañera she never had. Mariana decides to use the event to beta test her app, but things don't go as planned.
Taking place a few years after the events of The Fosters, Adams Foster siblings Callie and Mariana relocate to Los Angeles to begin the next phase of their lives. As they move into a communal living apartment building called The Coterie, Callie becomes a law clerk working for Judge Wilson while Mariana becomes a software engineer. The two of them navigate their young adult lives while interacting with their neighbors and the people they befriend.