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.
It's the least I could do as the one
who summoned you to this world.
Das ist das Mindeste, das ich tun kann,
nachdem ich dich in diese Welt beschworen habe.
Yo fui la que te invocó a este mundo.
Yo fui la que te invocó a este mundo.
È il minimo che possa fare 
dopo averti evocato in questo mondo.
Eu que te invoquei para esse mundo.
Это я призвала тебя в наш мир. 
Должна же я как-то расплатиться.