Anime: Sakura Quest
There is one episode in Sakura Quest where the main character Yoshino is forced to sell 1000 boxes of manju buns because the stupid Director of the Tourism bureau accidently bought too many. They decided to challenge Yoshino to sell all of them in only a week. Having accidently signed a contract with the bureau to work for them for a year without realizing, Yoshino accepts the challenge. The deal is that if she managed to sell all 1000 boxes in a week, she will be freed from any kind of contract with the bureau and Yoshino can go back to Tokyo, the place she really wants to go. And thus, the challenge begins.