After 50 first loves, Henry Ross (adam sandler) is a typical playboy. What he is best at is to make beautiful women of different identities fall in love with him and get rid of the relationship quickly afterwards. As a veterinarian in Hawaii Aquarium, Henry has endless romantic feelings to infect this leisure beauty. This time, he takes a fancy to Lucy (Drew Barrymore) who eats alone in a restaurant. They talked about everything together, built a small house with bagels, and laughed constantly. Henry couldn't bear to part with the girl and made an appointment to have dinner together tomorrow morning. However, the next morning, when Henry greeted Lucy warmly, Lucy was as cold as a stranger. It turned out that the girl suffered from strange short-term amnesia because of the car accident, and her memory stayed the day before the car accident. Henry, the lover, has his own problems. He fell in love with a girl who kept losing the memory of love.