Moscow. Denis Viktorovich, his six-year-old grandson Denis, is brought to the old resident of the house on Karetny. Grandfather Denis tells stories to his grandson every day about his age, who lived in a completely different era. Denis's grandfather's stories become a portal to his carefree Soviet childhood in one of the Moscow courtyards. Stories come to life, and grandson Denis embarks on a journey into the past. It turns out that at any time, children have a lot in common — curiosity, spontaneity, immense love and interest in how this world works.

A funny stories about a young boy Deniska and his best friend Mishka.

Moscow of the 1950s, June. Urban residents, having loaded all their scrub from mattresses to pots into suburban trains, leave for dachas and villages. Among them is the family of the boy Denis Korablev. Denis's parents don't really want to continue the tradition of renting a house for three summer months in the village, but Denis's grandmother is convinced that fresh country air is extremely useful to all of them. Life in the village is in full swing. Denis's dad rides a bike, Denis's mom walks around the village in a white sundress, Denis's grandmother makes jam from strawberries, which have been born a lot this year. Denis has fun in the village — he joins a local gang of boys, befriends a girl Lena, goes to the boat station and plays a lot of mischief. One day the most terrible thing happens to Denis for every boy — he falls in love.