Rubén Marcos is a loser who participates in championships of a real sport, chessboxing, which mixes chess and boxing, while he fights for the pagan love of his life and has to live under his father's obsession for success.
Rubén is that 'nerd' to whom no one has ever paid the slightest attention, but he is also a regional champion of Chessboxing (a discipline that mixes boxing with chess). For him it is not enough, and he is preparing to achieve the title of national champion.