Ordinary high school student Ken Usato is mistakenly suddenly summoned to another world along with his classmates and student council members Suzune Inukami and Ryûsen Kazuki.
Following the discovery of his unique power, Usato has been recruited (i.e. abducted) into the kingdom's Rescue Team...and he has no idea about the hellacious training he's in for.
Usato is quite literally thrown into his next training assignment: surviving the wild forest known as the Darkness of Llinger until he can hunt down its most fearsome inhabitant.
Captain Rose decides it's time for Usato to get a taste of what a healer's job is like on the battlefield, testing his resolve both mentally and physically. While training, Usato meets two more members of the Rescue Team.
Usato is drafted to help Inukami on her own training expedition outside the castle. He's only supposed to be there in case things go wrong, but things definitely go wrong when the two of them are stranded in the Darkness of Llinger.
Captain Rose receives grim news from the king: invasion is imminent. Can she rally her small team before all hell breaks loose? Moreover, is Usato even ready for war?
Now that Usato, Kazuki and Inukami all know that war is upon them, they must each steel themselves to face the battle ahead, because the invasion is coming...ready or not.
A look back into Rose's past as a battalion commander two years ago and her relationship with her old team. Just who were they? And where and why did things go so horribly wrong?
Resolve bridges Rose's tragic past into her present and possible future as she and the rest of the Rescue Team make their way to the battlefield where they will face the Demon Lord's army.
Usato, Kazuki and Inukami finally set foot on their first battlefield. The conflict is harrowing enough for all of them, but Usato's dark vision and reports of a terrifying foe among the demon army have him shaking in his boots.
A primeira batalha de Ken Usato rapidamente se transforma em um pesadelo quando ele percebe que seus amigos estão enfrentando seu inimigo, o Cavaleiro Negro. Será que ele conseguirá chegar a tempo de salvá-los?
After Linger defeats the Demon Lord's army, Usato faces new challenges, including managing a certain captured prisoner of war and dealing with the consequences of the battle.
Usato receives a special diplomatic request from the king as well as a personal request from the mysterious fox girl Amako, both of which will take him and his friends on a winding journey to new lands.
