Yuuto's been sent to another world, where he is now commander, or "Patriarch" of a clan of warriors.  To survive in this new world, he uses his cell phone, his only connection to the girl he loves back home.
But promise you'll come home, okay?
Aber versprich mir,
dass du zurückkommst, ja?
Pero prométeme que volverás.
Pero prométeme que volverás.
Mais tu as intérêt à revenir.
Ma promettimi che tornerai, ok?
Mas me prometa que
vai voltar, tudo bem?
Пообещай, что вернёшься, хорошо?