The plot is simple enough. Two women drudge thru (almost) 24 hours together. They learn more about each other than they'd probably like. Mostly I think, they learn they have to learn to love themself before they can truly love someone else. Also the scene where Laia holds her hostage in the bathroom is a huge metaphor I think. You can hold someone else emotionally hostage to make them stay around, to make them love you back.
So despite another a heart breaking movie, it does make you look into your own bad habits in relationships. Its like watching a cringy trainwreck because you kinda see yourself in each of these women.