Zhenya, simple and extremely good girl, living in a hostel, and works as a trolley bus driver. The main thing in life for her - to help people. She replaces colleagues at work, free lodges in her former teacher and gives hardly known girl her unique dress. Three friends make fun of her behind her back and are confident that her personal life does not shine. But Zhenya's inexhaustible optimism continues to believe that her trolley bus is traveling on the happy path.