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.
Y-You're right.
D-Du hast recht.
Tienes razón.
Tienes razón.
Oui, bonne idée.
Ha-Hai ragione.
V-Você está certa.
Ты права.