Psychologist Nastya Gracheva is a girl of strict rules from a decent family. She becomes disillusioned with men after the betrayal of the groom and decides on an unusual experiment. Nastya promises her colleagues to get married in the near future, but necessarily for love and with the help of the scientific method. Testing of the staff of her native institute points her to a suitable candidate — zoopsychologist Tema Maslov. The heroine suggests that he test her theory in practice: subjugate the heart to reason, fall in love with each other for the sake of science and deduce the formula of love in order to rid humanity of love suffering forever.