Mattsu, Yamma and Moburi - The Mystery of the Seven Gems and the Flying Castle

Matsuyama residents Mattsu and Yamma spend their free time searching for "the seven wonders of Matsuyama", a local legend. Their quest is interrupted by the arrival of two mysterious men. Moburi, a high school girl who takes on a maternal role for the boys, becomes entangled in their adventure, which is set in the city of Matsuyama. The group must navigate various challenges as they decide the future of their community.