Looking at Miyuki and Tatsuya now, it might be hard to imagine them as anything other than loving siblings. But it wasn't always this way... Three years ago, Miyuki was always uncomfortable around her older brother. The rest of their family treated him no better than a lowly servant, even though he was the perfect Guardian, watching over Miyuki while she lived a normal middle school life. But what really bothered her was that he never showed any emotions or thoughts of his own. However, when danger comes calling during a fateful trip to Okinawa, their relationship as brother and sister will change forever...

It's time for the National Thesis Competition to take place in Yokohama but what was supposed to be a grand event for the participating students has been turned into a battlefield. A mysterious band of armed magicians and mechanized weapons have stormed in and it may be up to Tatsuya and the others to get everyone home safely!

At the same that the leader of the USNA's elite magician unit, the Stars, traveled to Japan under the identity of an exchange student named Lina, the parasite incident wreaked havoc on the First Magic High School until Tatsuya and his friends saved the day and brought the incident to a peaceful conclusion. However, the parasite merely lost its first host and continues to wander this world. More importantly, it's found its next host-a humanoid helper robot. After copying Honoka Mitsui's behavior and patterns, the parasite has been reborn as Pixie, vowing to follow and serve Tatsuya. After learning more about parasites from Pixie, Tatsuya gathers Miyuki and the others to head towards the Aoyama Cemetery to fight against a new impending danger!

A suicide bombing brings the Master Clans Council to an abrupt close! Armed with only the knowledge that the explosion was triggered by corpse manipulation magic, Tatsuya sets off in search of the perpetrator along with Juumonji. After being egged on by his father, Masaki trails behind them to Tokyo in an attempt to one-up Tatsuya’s investigation. But things take a turn for the unexpected when Masaki summons up the courage to propose to Miyuki…

December, 2095. In exchange for Shizuku going to study in the USNA, Lina has been attending Magic High School in Japan. Tatsuya figured out her true identity as a member of USNA special forces right away but as soon as one mystery is solved, another breaks out. Right around the same time as Lina's arrival in Japan, there has been a series of attacks on magicians by something called the "vampire." But while Tatsuya and Mikhiko try to use old magic to discover the identity of this criminal, an assault on their school occurs!

The Nine School Battle. Ever year in mid-July, students from magic high schools all over the country gather to participate in fierce competitions of magical skill. Miyuki Shiba is among the members of the team First High will send to the battle. The magical skill of the competitors will be a huge factor, but there's another one-the tuning of their CADs. Luckily, they've got someone with them who specializes in the field-Miyuki's older brother Tatsuya. But when the Nine School Battle is targeted by a sinister group, all the talent in the world may not be enough to secure victory...

Two months have passed since the nefarious events surrounding the latest Nine School Competition, and its cerebral counterpart, the Thesis Competition, is fast approaching. Helping out First High with the event, Tatsuya will surely have his work cut out for him even if everything goes according to plan. Of course, nothing ever does, which might explain the letter from Maya Yotsuba containing a curious request: to assist in the capture of Gongjin Zhou, one of the masterminds behind the recent Parasidoll incident. Tatsuya and Miyuki depart for Kyoto, where they'll have to keep their wits about them to safely navigate the hidden schemes and shadowy conflicts that lurk just beneath the surface of the ancient capital!