After four years of living together, Léa dumps Mario. He is going to have to spend the loneliest summer of his life locked up in his Madrid apartment, with multiple broken bones. But this summer promises to be a journey in search of happiness, without leaving the downtown district. This trip will change the life of Mario, Chica, a mysterious young woman who appears on his doorstep, and Olmo the young and sassy neighbor, in love with Mario.