Ordinary high school student Usato is mistakenly suddenly summoned to another world along with his classmates and student council members Suzune and Kazuki.

Following the discovery of his unique power, Usato has been recruited/abducted into the kingdom's Rescue Team. And he has no idea the hellacious training he's in for!

Usato is quite literally thrown into his next training assignment: surviving the wild woods known as the Darkness of Llinger until he can slay its most fearsome inhabitant.

As the demon threat looms over the kingdom, Captain Rose decides it's high time for Usato to get a taste of what a healer's job is like on the battlefield. She tests his resolve, both mentally and physically.

Usato gets drafted to help Inukami on a training expedition outside the castle to get some real combat experience. He's only supposed to be there in case things go wrong, but things definitely go wrong!

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?