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.
When it's just the two of you,
Wenn ihr unter euch seid,
Si quieren, cuando estén a solas,
pueden llamarse por el nombre.
Si queréis, cuando estéis a solas,
podéis llamaros por el nombre.
Quando siete da soli,
Quando vocês dois estiverem a sós,
Когда вы наедине,