Olya Larionova fell in love for the first time, and it was so unfortunate! Sasha Dobrovolsky is one of the twin brothers... How to figure out which of the brothers she danced with at the disco, and who came to her on a date? After all, the twins’ favorite pastime is playing pranks on gullible girls... Day and night Olya was tormented by the question: does Sasha like her or is his tender attitude towards her just a continuation of the game? The girl was completely confused - and then her faithful friend Galka came to her aid with a whole fountain of ideas! The girls begin spying on their brothers. And they find out that the Dobrovolskys, taking advantage of their similarity, ugly deceived the teacher during the test. What to do? Help Olya's lover and his treacherous brother? Or, conversely, reveal their secret and thus punish the arrogant boys?..