Things take an interesting turn for Tanya and her mother when her father arrives with his foster son Kolya and new wife. This film is about Kolya and Tanya's bright, pure and bitter first love.

Cheerful, cheerful youth are famous everywhere for their ditties: mischievous and lyrical, thoughtful and sad, perky and poignant, they sound everywhere from early morning until late at night. Who composes them?..