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.
Gunmer Sword!
GUNMA-Schwert!
¡Espada Gunmer!
¡Espada Gunmer!
Gunlame !
Spada Gunmar!
Espada de Gunma!
Меч Гуммы!