An impregnable fortress able to withstand ten thousand men lies before them. If they refuse to capture it... the princess is a traitor!? Through a duel with Black Knight Jerome, Princess Altina earns the respect of her regiment and becomes the recognized commander of Fort Sierck. But celebrations are cut short by a barbarian attack, and in their vanguard stands an infamous warrior known as the barbarian king. Thanks to the wit of their tactician, Regis, the army snatches victory. But when news of their achievement spreads to the capital, Altina’s brother, Second Prince Latrielle, issues an order to capture an untouchable fortress in the Grand Duchy of Varden. It is an unreasonable demand made to weaken the princess’s growing forces, but they have no choice—refusal would have them branded as traitors to the empire. Regis speaks up. He has a plan to succeed where no army has before. Here is the second volume of a tale of war, love, and politics, woven by the bookworm and the sword princess.

Inept with a sword, unable to ride a horse, and apathetic toward the empire he serves, Regis Aurick is a hopeless soldier who spends his days buried in books. Banished to the borderlands, he encounters a stirring young woman with red hair and ruby eyes. She is Fourth Princess Marie Quatre Argentina de Belgaria, known simply to Regis as Altina. “…Do you want to become my tactician or not?” Having sought him for his rumored strategic prowess, she aspires to reform an empire led by self-seeking nobles and driven to pointless wars, the legendary blade of an emperor, the Grand Tonnerre Quatre, at her hip. Continuously underestimated by her regiment, including her would-be tactician, the princess resolves to prove her worth beyond a shadow of a doubt—no matter the risk. Here is a tale of war, love, and politics, woven by the bookworm and the sword princess.

Fourth Princess Altina has been chased from the imperial court and assigned to command a faraway unit on the border. If she wants to one day become empress, what she needs most is wisdom. “The Eve” recounts the first time she learns about the bibliophagic tactician who goes on to become her biggest ally. A young Felicia must uphold a deception of the grandest scale, taking on a new identity to live as her late brother. Find out her fate in “Auguste, the Silver Princess.” Finally, in “A Vow to the Morning Star,” Third Prince Bastian sets off with Elize—whose right to the High Britannian throne has been stolen from her—to write a new story. Here is a set of short tales from the popular military fantasy!

What will happen when the bibliophagic tactician Regis faces off against the strategy officer chosen by a queen? Led by Oswald, the High Britannian Army begins its march across Belgarian soil. Altina’s forces must lend their aid to the losing imperial army, but the Grand Duchy of Varden chooses this exact moment to attack Fort Volks. Regis proposes a plan to send Varden’s troops packing in a single night, but it comes at a cost: the treasured sword is put out of commission, and Belgarian casualties are continuing to pile up. Will they really be able to protect the Empire!? As the battle continues, an unexpected encounter reveals more about Regis’s past... Here is the fifth volume of a tale of war, love, and politics, woven by the bookworm and the sword princess.

“There are plenty of ways to defeat a navy that has nothing but its strength going for it...” After going up against High Britannia’s newest weapons, the Empire’s Seventh Army is helplessly defeated. While Regis’s command allows them to barely avoid complete and total annihilation, the Empire remains in a terrible predicament—the only way to stop the enemy invasion is by severing their sea routes, but the Belgarian Navy is facing great difficulties from another new innovation known as the steam ship. And so, Altina’s army heads to Port Ciennbourg to salvage the naval front. But with only sailing ships at its disposal, does Belgaria really have the means to turn the tide?! Here is the sixth volume of a tale of war, love, and politics, woven by the bookworm and the sword princess.

High Britannia and Langobarti have joined forces, and now the two nations’ troops occupy the fortified city of Grebeauvoir! At the request of Second Prince Latrielle, Regis joins the First Army in its campaign to recapture the stolen territory, devising a scheme that ultimately allows Third-Grade Combat Officer Jean Juris de Varèse to infiltrate the city. With the cooperation of a girl named Fel, it is the esteemed officer’s duty to meet the representative of the captive civilians. Will the conflict with High Britannia finally reach its conclusion? Here is the tenth volume of a tale of war, love, and politics, woven by the bookworm and the sword princess.

Kaito Sena's life hasn't exactly been easy. Unfortunately for him, death isn't about to get any better. Summoned by none other than Elisabeth Le Fanu, the "Torture Princess," Kaito has to choose what he wants for his second life-be her butler, or die a long, painful death by torture. What is he to do but become her servant...and help her eliminate the fourteen ranked demons wreaking havoc in the world! See the original light novel come to life in this gritty manga adaptation!