Mariana, a talkative and fun young woman, has the opportunity to be sent to university thanks to the charity of a benefactor who sponsors the city's municipal orphanage where she has lived all her life and is an assistant to the institution.

Mattia is about to move to Madrid by his boyfriend Eduard. When the day before leaving for Spain, Eduard announces his arrival in Rome to know the "laws", Mattia must choose whether to finally come clean with his companion, or confess to being a formidable liar.