A boy decides to stay in sixth grade for another year in order not to be separated form the girl he's in love with.
The heroes of the film are first-graders Snezhana and Alyosha Seroglazov, who received the nickname "TwoBriefcases" because of his small stature on the first day of attending school, as well as a small puppy Kysh.
A story about a group of countryside children playing detectives in their village.