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.
So don't stay up too late, okay?
Bleib nicht so lange wach, ja?
No te quedes despierto hasta tarde.
No te quedes despierto hasta tarde.
évitez de veiller trop tard.
Non fare troppo tardi, ok?
Então não fique acordado
até tarde, tudo bem?
так что не сиди допоздна, хорошо?