The sibling pair, Tatsuya and Miyuki, stroll together through the town to celebrate their graduation from middle school. Their behaviour feels more like they are on a date when suddenly Tatsuya gets a call from the head of the family. Leaving his sister behind, Tatsuya goes to meet with the head butler regarding a job to disable a pyrokinetic who plans to attack the place where Tatsuya arranged to meet up with his sister. Tatsuya rushes back; in the meantime, the fire alarm goes off in the building where Miyuki is waiting. Investigating the cause of this unnatural fire that the sprinklers couldn't handle, she finds a magician to be the reason behind it.
Miyuki manages to suppress the magic of the pyrokinetic magician; even the pistol the magician tries to use doesn't work against her. When the magician draws out a knife, Tatsuya rushes in and defeats the magician using only close combat fighting techniques. The head butler makes sure that all pictures from this incident give no clear visual image of Miyuki as part of the clean up. However, despite the efforts of the head butler some people at the First High School manage to find out that the new honor student Miyuki was the one in the pictures about the incident; and they plan to recruit her for the Student Council.
As the freshman representative, Miyuki has to give a speech in front of all the students during the entrance ceremony of the First National Magic University Affiliated High School. Afterwards the Student Council President Mayumi Saegusa tries to invite her to join the Student Council.
This chapter also tells us about the outstanding results both siblings had during the entrance exam and introduces Honoka, Shizuku, Erika and Mizuki. Also the 2 different uniforms are shown for the Course 1 students (called Blooms, having the flower-shaped school symbol on their uniforms) & for the Course 2 students (called Weeds, not having the school symbol on their uniforms). Some of the Course 1 students are Miyuki, Honoka and Mayumi; and some of the Course 2 students are Tatsuya, Erika and Mizuki. It also shows the Course 1 students' attitude of looking down on the Course 2 students.
On the way to school, Miyuki gets angry because her parents congratulated her for joining the First High School but not her brother (because he is “just a Guardian”). At the classroom Honoka tries to introduce herself to Miyuki but fumbles at this, so her friend Shizuku comes to help her out. Miyuki also draws a lot of unwanted attention from the male students in her class. After class orientation they have learn emission-type magic, where Miyuki shows her superior knowledge. After class, it is time for lunch break; but when Miyuki wants to sit on the same table as her brother, there is a male student from her class who starts to verbally attack the Course 2 students at the table.
Even though Tatsuya managed to avoid an escalation of the conflict by pretending to be finished and leaving the table, the same person that insulted the Course 2 students during lunch continued what he started at the school gate on the way home. This time the offender even went so far as to draw his pistol-shaped CAD; but before he managed to activate magic, that CAD was sent flying because of an attack from Erika. Honoka also tried to activate magic, but the arriving Student Council President prevented that. Thanks to quick thinking by Tatsuya there was no disciplinary follow-up to this incident. The next morning Miyuki and her brother are invited to visit the Student Council Room during lunch.
During the lunch at the Student Council Room, Miyuki is invited to join the Student Council. Miyuki's request that her brother also join the Student Council is rejected, because by rule only students of Course 1 are permitted to join it; instead he is invited to join the Disciplinary Committee. Vice President Hattori opposes a Course 2 student joining the Disciplinary Committee; and because in the process Hattori insults his sister, Tatsuya challenges him to a mock battle despite not being interested in joining the Disciplinary Committee.
The mock battle is instantly won by Tatsuya using triple overlapping waves from a limited-edition Silver Horn C.A.D. that is optimized for Loop Casting. With that victory Tatsuya negates Hattori's objections, and he becomes a member of the Disciplinary Committee. Miyuki is then introduced to her new work for the Student Council by Nakajou-senpai. Mayumi teases the siblings, which actually makes Miyuki a bit insecure.
At home, Miyuki wants her brother to change some of her activation sequences in her CAD. After the measurements for this are finished, the conversation turns to the female upperclassmen on the Student Council; Tatsuya admits to finding them charming. Miyuki is angered by this (her brother's words) and attacks her brother with magic, blasting him unconscious; but even before he hits the ground, a kind of self-repair technique starts and he awakens unhurt. The next morning, during the time Tatsuya has his morning training, Miyuki thinks about her feelings for her brother and remembers the past event where her brother saved her life.
Elsewhere Sayaka Mibu, another Course 2 student at First High School, is brainwashed to hate the Disciplinary Committee leader and fight the discrimination at the school.
The week of club recruitment (or as Mari prefers to say, the week of chaos) begins. Because the wearing and use of CADs by all students is allowed during this time, both the Disciplinary Committee and the Student Council members are very busy. At the schoolyard Honoka and Shizuku are swarmed by club members trying to recruit them. Suddenly both are grabbed by 2 girls on skateboards and taken away; Mari starts to chase after them on a borrowed skateboard. In the meantime, elsewhere Tatsuya apprehends someone.
The skateboard pursuit continues and both parties start to use magic. The two kidnappers manage to escape after dropping Honoka and Shizuku at the S.S. Board Biathlon Club recruitment station. Both Honoka and Shizuku decide to join the club after hearing the explanation of what this club is about. Later, while helping some sickened people of the Hunting Club, Honoka and Shizuku are introduced to Akechi Goldie, another first-year student.
On the way home Hanoka did use some illusion to get Shizuku, Akechi and herself trough the still ongoing recruitment. The girls observe how Tatsuya was attacked by a 3rd party when break up a conflict. After some discussion the girls decided to find some prove about the attacker but had to run from the recruiter first because the illusion stopped to work.
At an other place 2 persons talk about the apprehending Tatsuya did in Chapter 9 especial about the unusual magic he was using then.
Bonus chapter: Miyuki can’t decide what clothes she should wear.
Kirihara is interrogated by Juumonji about the reason he used deadly magic. A bit later Miyuki and Mayumi have some talk about the report of this interrogation.
From the roof Hanoka, Shizuku and Akechi observe when Tatsuya negated a magical attack on him from the kendo club captain. After asking Miyuki they could confirm that Kinoe Tsukasa was the one who attacked Tatsuya.
Tatsuya talk with his sister about Hanoka and Shizuku and that they observing him. He also mention to her that they where taking pictures of the person messing with him. The next day a picture of someone running away is handed around between member of the Student Council and Disciplinary Committee but it wasn’t proof of a magical attack as the sender said it will.
Later Mibu is looking for Tatsuya.
While Tatsuya is escorting Miyuki to the Student Council Room Mibu introduce her self to them and ask for a meeting with Tatsuya.
The next day in the afternoon when the sibling sitting together with the Student Council and Mari the talk comes to the meeting with Mibu. From the teasing of Mari Miyuki lost the control of her magic. Thanks to this Tatsuya was forced in telling the group that Mibu think the Disciplinary Committee Member are doing their job just to get better grades what is instantly denied by Mari. He also mention that Mibu think that people get preferential treatment in club activities when they are good at magic and that the non-magic clubs decided to coordinate because of this. But to the question of Tatsuya what they do after they told the school what they think Mibu couldn’t give an answer.
Mayumi tell the other that this school is undermines by Égalité a lower branch of Blanche an anti-magic group.
Miyuki gets a detailed explanation from her brother about the terror organisation Blanche and the branch organization Égalité. They also hope that President Seagusa resolves the issue so their family doesn’t get involved.
After not seeing any result from the picture they reported anonymously Honoka, Shizuku and Akechi decided to follow Kinoe Tsukasa secretly.
Honoka, Shizuku and Akechi are ambushed by Blanche while following Kinoe Tsukasa and are overcome by antinite. Miyuki ,unfazed by the anitinite, foils the ambush and asks for Kokonoe Yakumo to incarcerate the incapacitated members of Blanche.
Kinoe Tsukasa and his older brother discuss searching for the ambush team to silence them and that the time has come to assault First High.
While Tatsuya goes to FLT, Miyuki goes out shopping. While shopping Miyuki comes upon a helmet similar to the one worn by Blanche, reminded of the incident she goes to Yakumo’s temple and speeds along the interrogation through the use of MI magic.
Sayaka Mibu and Égalité members take over the broadcasting room, the next day Miyuki discusses recent events with Honoka and Shizuku.
Tatsuya and Miyuki go to Yakumo’s temple to learn more about Kinoe Tsukasa. They learn that his brother, Hajime Tsukasa, is the leader of Blanche.
The day of the debate between Mayumi Saegusa and the First High Égalité members. During the S.S. Biathlon Club practice Honoka and Shizuku discuss if they should have gone to the debate but are interrupted by the club chief, Tsugumi Igarashi. She informs the club that the school has come under attack. Honoka comes under attack by a knife wielding Blanche member, Honoka hesitates but is saved by Shizuku and Tsugumi.
Morisaki Shun stops by to check on and warn the S.S. Biathlon Club, he recounts the exploits of Mari and Hattori at the Auditorium.
Miyuki intervenes in the fight between Leo and three members of Blanche sending them flying. Erika and Haruka Ono show up and Haruka requests they save Sayaka Mibu.
While Leo joins the melee outside the library, Erika, Miyuki, and Tatsuya sneak inside. Tatsuya determines the location of all the terrorists posted inside the library with his elemental sight. After Tatsuya informs the group of the terrorists location, Erika dashes out of hiding and quickly incapacitates two of the guards. Two more come rushing down the stairs, Miyuki causes one of them to trip down the stairs while Erika holds the last one off. Miyuki and Tatsuya head to the library’s viewing room.
Meanwhile Sayaka reminisces about her motivation to end discrimination. Sayaka ends her self reflection with Tatsuya and Miyuki breaking down the door.