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.
"Gunma's Mysterious Underground Empire."
„GUNMAs mysteriöses
unterirdisches Reich“.
"El misterioso imperio subterráneo
de Gunma".
"El misterioso imperio subterráneo
de Gunma".
Le mystérieux empire souterrain
de Gunma.
Il misterioso regno sotterraneo di Gunma.
"O misterioso império
subterrâneo de Gunma".