The Cat Returns (story)
From GhibliWiki
Haru-chan, a normal girl in a normal town, saves a strange cat carrying a present from being overrun by a truck. In return she's going to receive lots of favors, including marriage to the crown prince of Cat Kingdom. As she finds that a bit too much, she gets into contact with the Cat Business Office. Together with CBO's owner, the Baron, she enters the Cat Kingdom to try and prevent her marriage.
