When the Hirano sisters and Yuna and Stitch decided to come to Tokyo at the same time. The reason the Hirano sisters come to Tokyo because the visit of their grandmother and their cousins. For Yuna and Stitch, just a road trip by a airship.
Disclaimers: Ginger and Stacy belongs to Dan Povenmire and Jeff "Swampy" Marsh
Stitch belongs to Chris Sanders
Yuna belongs to Masami Hata