The death of Orimura Ichika! Phantom Task has gained control of the English anti-IS orbital cannon “Excalibur” after a successful raid, but things go wrong when the controls stop responding and it begins to de-orbit. Meanwhile, Cecilia scores a theme park birthday date with Ichika on Christmas Eve, but that glimmer in the sky isn’t a romantic flurry of snow—it’s a barrage of lasers from Excalibur! Amidst the commotion, Chelsea appears in the third BT prototype, challenging Cecilia to a duel. And the remaining cadets scramble into action to fulfill their special orders: the destruction of Excalibur before it wreaks any more havoc. As his mission begins, Ichika rises to his final frontier...

“Ufufu. And YOU shall be my attendant.” Iris, the seventh princess of Luxembourg, has arrived at IS Academy—and taken Ichika as her servant. Ling is less than pleased, and when Iris proposes eloping back to her country, she challenges her to an IS match to put a stop to it. But even teamed up with Houki, the two can’t keep up with her fourth-generation IS... And if that isn’t bad enough, the changes Houki’s been going through prompt a previously unknown squad of mass-produced IS to kidnap her! Ichika and the other cadets are thrust into the battle that will later be known as the Akatsubaki Incident. Chaos swirls around the red camellia in the twelfth installment of Infinite Stratos!

In a world of technological progress, females are the only ones who can pilot the most advanced military unit in history--the Infinite Stratos (IS). With this power, women have seized complete control of all political, social, and economic ventures; leaving men to the fringes of society, made to tend to the whims of their now, female overlords. That is until Orimura Ichika, the sole male found to have IS piloting ability, is thrust into the spotlight, and enrolled at the prestigious IS Academy. Stuck in the middle of a female-dominated population, Ichika sets out to prove men still have a place in this world. Little did he know, he is just the thing these women have been looking for.

A storm is coming! "Therefore, the student council have selected an advance scouting team to visit Kyoto." Ichika and the girls head for Kyoto at Tatenashi's request, with their minds on memories which will last a lifetime, and his on their secret mission to root out a Phantom Task cell. But when the second Brynhildr shows up too, things start to go off the rails! Under the fiery scarlet foliage of the ancient city, two battles unfold—one fought with quiet sighs and long gazes, the other with overwhelming firepower!

The battle against Phantom Task and Unnamed during the World Purge incident didn't just leave Tatenashi wounded—when Ichika swooped in to save her life, it melted her heart, too. (What do I do? I'm falling for him...) But she's not the only one after our hero, as the rest of the crew won't be content to sit back and watch as they grow closer. With Field Day coming up, it's the kind of race for his affection that could only happen at IS Academy! All's fair in love and war in the ninth installment of this high-speed school battle romantic comedy!

Ichika is just beginning to settle in as the world's only male IS cadet when two new classmates arrive: the dashing French scion Charles and German soldier Laura. Will he discover Charles's secret? Why does Laura, who he's never met, hold a grudge?

The Duchy of Brunhild is abuzz with confusion as a great airship appears in the sky, bringing with it a group of curious Gollem engineers! But what do these mysterious Seekers want with Yumina's white crown? And just what secrets lurk within the ancient ruins of Gandhilis? More importantly, will Yakumo ever come home? Hold fast for a tale of swords, sorcery, and mechanical marvels!