Gunma-chan, Uncle Akio, Aoma, and Meemi visit Gunma's kofun site and wander into an alternate world beneath Gunma in the Season 2 finale.
Gun-magatama!
GUNMA-gatama!
¡Gun-magatama!
¡Gun-magatama!
Gunmagatama !
Gun-magatama!
Gun-magatama!
Яшма Гуммы!