19. A Beautiful Girl that Nobita Loved

Upon feeling lonely, Nobita encounters a beautiful robot girl named Lulli, who was sent from the future by criminals, Walzer and Gondo, to assassinate him. The villains plot to change the future by killing Nobita, who would otherwise thwart their crimes. However, after spending time with Nobita and experiencing his kindness, Lulli has a change of heart and is unwilling to harm him. When a more powerful robot terminator arrives to finish the job, Lulli sacrifices herself by destroying both the bomb meant for Nobita and the terminator. Though heartbroken, Nobita finds solace when a "Bird of Happiness" appears, which Doraemon suggests is a final message from Lulli.