S1·E122 Legend of Kaguya. Gash's Summer Festival. Girl Who Returned to the Moon.
Aired September 4, 2005
Synopsis
Zatch and Ponygon are taken to a festival by Kiyo's mother. Once there, Zatch separates from them and meets up with a rich girl named Natsuko who snuck away from her bodyguards in order to enjoy the festival.