I Love Sarah Jane (2008)

Jimbo is thirteen and he has a crush on Sarah Jane, the girl of his dreams. She still doesn't want to hear of him. But Jimbo is persistent. He will make Sarah Jane fall for him, no matter how long it must take. And what does he care if he lives in a post-apocalyptic environment? If all the adults are dead? If the place is infested with zombies? Jimbo loves Sarah Jane. That's that.