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.
I know that.
Ich weiß doch.
Ya lo sé.
Ya lo sé.
Je sais.
Lo so.
Eu sei disso.
Я знаю.