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.
Let's be friends, Great Black 
Haniwa-san of the Dark Continent.
Lass uns Freunde sein,
dunkler Haniwa Black Großkönig-san.
Soyons amis, Haniwa Black,
Éminent Seigneur des Ténèbres.
Grande Haniwa nero del continente oscuro,
diventiamo amici!
Vamos ser amigos, Grande Haniwa
Negro do Continente da Escuridão.
Давай дружить,
владыка тьмы Чёрный Ханива.