The Irregular at Magic High School

It is the year 2095, and Tatsuya Shiba and his sister Miyuki enroll at the First Private Magic University Affiliated High School, but due to the difference in their grades in the practical exam Miyuki is placed in the Course 1 curriculum with the other students who have demonstrated high magical skills, (informally known as "Blooms") while Tatsuya, on the other hand, having scored poorly on the practical exam is assigned to the Course 2 curriculum (insultingly called "Weeds" by Course 1 students) even though he placed first in the theoretical exam. Tatsuya becomes acquainted with several Course 2 students including Erika Chiba, Leo Saijo and Mizuki Shibata. The chasm between the Weeds and Blooms leads to a confrontation when a number of Miyuki's classmates object to her hanging around with her brother and his new friends. Violence seems imminent but the magic sequence is disrupted by the student council president as she arrives with the chair of the disciplinary committee.

Tatsuya's skills and wits have earned him and his sister the scrutiny of Mayumi Saegusa, Student Council president and Mari Watanabe, leader of the Public Morals Committee. Mayumi invites Miyuki to join the Student Council as the first year representative but she initially declines and puts her brother's name forward. Upon learning that, by school regulation, year representatives must be Course 1 students she accepts. Not wanting to waste his talents, Mari proposes that Tatsuya be the Student Council's nominee for a vacant position on the Public Morals Committee, which President Saegusa agrees to. At a meeting later that day, Student Council vice-president Hanzo Gyoubushoujo Hattori opposes Tatsuya's nomination which prompts Miyuki to defend him. Hanzo reprimands her for her seeming bias toward her brother which causes Tatsuya to challenge him to a magic duel. Tatsuya easily defeats Hanzo, much to the surprise of the Student Council.

The Council cannot reconcile Tatsuya's flawless victory in his duel with Hanzo with his poor showing in the practical exam. Once he regains consciousness, Hanzo tacitly withdraws his objection to Tatsuya's nomination by apologizing to Miyuki. Mari introduces Tatsuya to the other members of the Public Morals Committee, who note the fact that he's a Course 2 student, but warmly welcome him on learning of his victory over the previously undefeated Hanzo. To his dismay, Mari informs Tetsuya that Shun Morisaki, the Course 1 student who started the altercation on their first day, is also joining the Committee on a faculty recommendation. His first taste of action involves a confrontation between the kendo club and kenjustu club. The head of the kenjutsu club, who combine magic with swordplay, forces Sayaka Mibu, a member of the kendo club and Weed, to spar. When he loses, he uses magic in a follow-up attack, in contravention of the rules. Tatsuya steps in and arrests him but is assaulted by the rest of the kenjutsu club who refuse to acknowledge his authority just because he is a Weed.

Tatsuya is approached by Sayaka Mibu, who wants his cooperation in a plan to put an end to the discrimination between Blooms and Weeds at the school. He refrains from giving an immediate answer. His suspicions that she is being manipulated by someone else with ulterior motives are aroused when she is unable to give him proper answers to his questions.

Tatsuya rejects Sayaka's offer and a group of Weeds led by her lock themselves in the broadcast room, creating a commotion at school. Mayumi elects to listen to their demands and discuss them in front of the student body. Debating the school's position by herself, she is on the verge of arranging a compromise when the school is attacked by terrorists.

The Student Council and Public Morals Committee defeat the terrorists and find out that the attack was merely a cover for an information raid on the school's computer library. Tatsuya and his friends are tasked with countering the raid. They defeat the terrorists, including Sayaka, and take them into custody. After learning of Sayaka's reasons for cooperating with Blanche, the terrorist organization behind the attack, Tatsuya decides to attack the enemy hideout in order to help clear her name and strike back at them for using her and invading the school.

Tatsuya and his friends storm Blanche's hideout where they confront the group's leader, who confirms that he had manipulated Sayaka's memory. Despite a number of traps the students are able to subdue the terrorists. After Sayaka is released from the hospital, Tatsuya and Miyuki return to their normal school life.

The inter-school sporting event known as the "Nine Schools Competition" is at hand, and Tatsuya, in recognition of his superior magic-tuning skills, is named to the engineering squad, over the objections of a number of Course 1 students. After school, Tatsuya surprises his sister when presents her with a magic tool he developed that allows a person to fly, a feat that no one has never attained before.

Tatsuya and Miyuki pay a visit to Four Leaves Technology, where Tatsuya unveils his flying CAD to Ushiyama, the other half of the genius magic engineer Taurus Silver. After a brief encounter with their father, the siblings set out for the Competition, but on the way there, a traffic accident occurs, putting the students in danger.

Tatsuya, Miyuki and Katsuto Jyumonji act to prevent the car from ramming into the bus. From traces that his is able to find, Tatsuya determines that the incident was orchestrated to look like a traffic accident but was instead a suicide attack. On arriving at their hotel Tatsuya and Miyuki are surprised to find Erika and Mizuki present. The event opens with a banquet where the students from the nine competing schools mingle, unaware that unknown enemies are threatening the event.

The Nine Schools Competition begins and Tatsuya puts his tuning skills into practice in order to help his friends performance, while staying on watch for further disturbances.

One of Tatsuya's friends is involved in a serious accident during the competition and the other students increase their vigilance after Tatsuya reveals that she was actually a victim of sabotage.

The "No Head Dragon," an underground syndicate is eager to interfere in the competition for the sake of their profits and the First High School is their main target. Meanwhile, the students under Tatsuya's care are doing better than expected in their events, drawing the attention of those who still can't acknowledge his talent just because he is a Course 2 student as well as First High Scool's main rivals from Third High School.

The Nine Schools Competition proceeds without further incident until a number of students are seriously injured under suspicious circumstances and Tatsuya is tasked with assembling and leading a team to compete in their place.

Tatsuya enters the competition with his friends Leonhard Saijo and Mikihiko Yoshida in the "Monolith Code" event. While watching out for No Head Dragon's interference, Tatsuya makes preparations to confront the two most gifted students of Third High School, Masaki Ichijou and Shinkurou Kichijouji in the final match.

Tatsuya and Masaki's teams face off in the final match. Despite knowing that with the rules standing, Masaki's abilities surpass his, Tatsuya confronts him head on, resulting in a spectacular duel. Making a critical mistake, Masaki breaks the rules by accidentally using a lethal attack on Tatsuya. Tatsuya manages to defend partially, but is hit and seriously wounded. However, he uses his self-restoration to overcome his injuries and while Masaki's still in shock from allowing himself to make such a mistake and/or possibly killing his opponent, Tatsuya incapacitates him at point-blank range. Meanwhile, Mikihiko faces off against Cardinal George in a lengthy duel, during which Leo helped Mikihiko only to be hit by Masaki's spell. Mikihiko finally defeats George, but is on the verge of losing to the third member of Masaki's team, when Leo manages to deliver the final blow, allowing First High to win the match.

Desperate with the recent developments, No Head Dragon start interfering with the competition directly, risking the lives of players and audience alike. However, Tatsuya remains vigilant to stop their plans, specially when Miyuki becomes one of their main targets.

Tatsuya attacks a meeting of the No Head Dragon members by casting extremely long range magic from a tower visible from their meeting place. After learning that the head of the organization's name is Richard Sun, Tatsuya proceeds to kill everyone present at the meeting, mostly influenced by his feelings for his sister. On the next day, the competition ends with Jyumonji single-handedly winning the Monolith Code event, confirming the championship for First High School. After Mayumi and Jyumonji discuss the long-term effects that Tatsuya's victory over Masaki (the probable future head of the Ten Master Clans) as the reputation of the Ten Master Clans could be tarnished, Tatsuya is asked by Jyumonji to join the Ten Master Clans by marrying Mayumi or one of her sisters.

Following his feats in the Nine Schools Competition, Tatsuya is scouted to participate in another important event, the "Magic Thesis Competition" and his team has only a few days left to produce the applicable material before the deadline. Back at home, Tatsuya and Miyuki have an encounter with their step mother, who enlists Tatsuya's help to replicate an elusive relic that can change the history of magic forever, but a new group of enemies appear, intending to steal it.

While gathering material for the thesis, Tatsuya gathers allies to start his own investigation on who intends to steal his and his family's secrets for themselves.

The Magic Thesis Competition team meets continued success in developing their project, though Erika, Mikihiko, and Leo apprehend a fleeing student, Chiaki Hirakawa, who is revealed to be working as a spy against the First High team. Chiaki admits to working against Tatsuya personally, passionately believing that he is responsible for Kobayakawa's accident during the Mirage Bat event of the Nine Schools Competition. Erika and Leo take a day off together to train Leo how to use lethal magic, Erika believing the conflict will quite likely escalate to kill or be killed. Mikihiko chases after an embarrassed Mizuki, unintentionally bumping into an ominous figure dressed in a First High student uniform.

Lu Gonghu's attempt to remove Chiaki is foiled by Watanabe and Naotsugu Chiba. Mr. Zhou visits Chiaki and appears to cast a memory charm so that she will forget about her involvment with them. Saegusa, Watanabe, and Tatsuya go to the detention facility and elicit a confession from Sekimoto on his intention (and unsuccessful attempt) to steal the Magic Thesis project data and locate the relic. Lu Gonghu appears again, apparently to silence Sekimoto, but is defeated by the three and taken into custody.

Chen Xiangshan appeals to Mr. Zhou to free Lu Gonghu during a prisoner transport, and Chen promises to watch over Chinatown during the operation. Lu Gonghu is broken out shortly after by Mr. Zhou's forces. Ichihara visits Chioda to convince her to hold onto her feelings of bitterness for Tatsuya, believing it could be the key to Chiaki surpassing Tatsuya in skill one day. Further questioning revealed that Sekimoto was operating against the Magic Thesis team under mind control by an adversary organization. At the convention, Jumonji elects to increase security and have all Joint Security Force members wear armored vests. The First High Magic Thesis team successfully delivers their presentation to the audience, with Cardinal George congratulating Tatsuya backstage but promising that his school will beat them. Before they can begin their presentation, however, the convention center is attacked.

The convention defense forces engage the assaulting teams but are bogged down by slow progress with evacuating the students and convention personnel, but discover that the attack is being launched from an unidentified disguised ship anchored in the harbor. Armed assailants assault the main hall, but are easily countered by Tatsuya after he inspires the other students to resist. Cardinal George confronts Tatsuya on using a top-secret technique used by STARS called Molecular Divider, but Tatsuya ignores him, saying that he doesn't have time to explain himself. Asuza casts a charm to calm everyone in the hall, and the evacuation begins to an underground shelter via an emergency underground tunnel. Tatsuya's group lead the counterattack against the main terrorist force attacking the center. Shizuku uses her family's knowledge to take the group to the VIP conference room so they can use the network to get a better idea on what's going on outside, then meet with the rest of the First High student council members in the green room to discuss their next move. The group deciphers the enemy's motive to be to raid the Magic Association's main database. Just as the group decides to evacuate to the shelter with everyone else, Major Kazama and Fujibayashi arrive and dispatch new orders to Tatsuya, revealing to everyone's great surprise there that he is a JSDF operative. Major Kazama tells everyone that this is confidential information, and his status must remain secret. Miyuki unlocks the seals on Tatsuya's powers and activates him to answer the JSDF's call to defend the city.

Crimson Prince brutally kills attackers while his allies look on in comparable horror. The main personnel evacuation continues through the tunnels despite resistance, Mr. Tsuzura prevents a ceiling collapse that would have killed many of the people in the tunnel. Mayumi and Shizuku call their fathers to lend helicopters to evacuate the personnel who were unable to reach the bunker, and everyone is extracted. Tatsuya takes to the skies in the flight suit, which R&D had improved beyond his own design, and begins by destroying the attackers' recon drones.The battle for the city continues, with notable First High members and Crimson Prince fighting back the attackers. Kirihara is severely wounded and Kei is hit by shrapnel in an ambush, but Miyuki arrives, eliminating the attackers using Cocytus and calls for Tatsuya, who uses his magic to restore both Kirihara and Kei before departing to support another area.

The episode starts with Tatsuya and other airborne comrades obliterating an enemy mechanized battalion. Some enemy soldiers recognize him as Mahesvara. Meanwhile, Jummonji leads magicians from Magic Branch Association charasmatically, resulting in the enemy retreating. The Crimson Prince reaches the house of Zhou Gongjin and demands that he allow him to kill the perpetrators, to which Zhou agrees and assures The Prince that he had also been victimized. The scene then moves to the Saegusa helicopter. The students in the helicopter are very curious about Tatsuya's magic, which healed Kei and Kirihara's wounds. Miyuki explains Tatsuya's magic Regrowth and how he has to take a lot of pain whenever he uses it. Later, they defeat Lu Gong-Hu and his employer at the branch of Magic Association building. The battle proceeds with the airborne troops and the magicians led by Jummonji, sandwiching the enemy from 2 sides, successfully obliterating most of the enemy. Some manage to escape to the camouflaged ship, though. Later, Major Kazama authorizes Tatsuya to activate Strategic Class Magic, Material Burst, which can convert mass into energy. Tatsuya uses Material Burst on the prepping Great Asian Alliance's navy, completely annihilating them. Meanwhile, Miyuki has a short talk with Yotsuba Maya, who invites them to come by the Yotsuba House. The event is referred to as Scorched Halloween, the day when magic surpassed any mechanical weapon. The episode ends, with Yotsuba Maya inviting Kazama and the siblings on the same day, while Tatsuya hugs Miyuki, on his return.