The main character Klichenko Ksenia, a teenage girl comes to visit relatives whom she has not seen for several years. Meeting her cousin Mark turns her whole life upside down, she falls desperately in love with him, despite the fact that they are relatives. Ksenia is afraid of these feelings, afraid of being ridiculed, and hopes that this love will pass, like childhood crushes. Only the feelings grow and get stronger, and at some point she realizes that Mark is also not indifferent to her. But sooner or later everything secret becomes clear - everything becomes known to the family.