The action of the film begins in the Crimea in 1787. Representatives of the Western powers once again begin their intrigues against Russia, but the main characters, former midshipmen, who have already reached a respectable age by this time, and their adult children, stand up to defend their homeland. They have to sail to the Crimea from Malta and there take part in the war with Turkey; in particular, to take part in the battle of Kinburn under the command of Suvorov.

They are neither adults nor kids - somewhere in between, living in their separate boys and girls cozy dorms and doing whatever they love to do - inventors, artists, poets, mechanists, scientists and....just dreamers! These enthusiastic and creative folks enjoy their half-adult, half-childish lifestyles and entertain each other with the different tricks and practical jokes. The main hero stands out of the crowd - while the others try to live the normal life socializing as they can, he can never be rested, always coming up with the different unpredictable and unexpected moves, which always make viewers burst with laugh....

There is a seven-year war, Russian soldiers are forced to fight for the interests of France and Austria against Prussia. The midshipmen continue to selflessly serve the Motherland. One is on an expedition, the other is at court, and the third is sent to Venice to hand over a jewelry box. In fact, there is a message in the box, on which the future fate of Europe and Russia depends!

In the second movie the Naval Cadets are guarding the princess coming from Germany to marry a Russian prince.

In third part of "Lovey-Dovey" Andrey and Marina are exchanging bodies again - but this time with their parents in law.

Andrei and Marina are married for 7 years and they feel there is no more love. They ask a famous doctor to help them, and he helps... by putting their minds into the bodies of each other. Now Andrei is in his wife's head, so he lives the life of his own wife, who runs an art gallery, and Marina in the body of Andrei becomes a lawyer...

A twelve years old girl Lena who has come to live with her grandfather in a small Russian town is being bullied by her classmates. She took the rap of being a class traitor because she was in love with the boy who had betrayed his classmates when they were bunking off and going to cinema instead of a literature lesson. The class is penalized for that, not being allowed to go to Moscow for fall holidays with the rest of the school. Lena is being ostracized, "boycotted" however not telling the truth, waiting that the boy himself would confess to be guilty.