The countdown to extinction begins on Sunday with the arrival of the Septentriones, otherworldly invaders set on the eradication of mankind. Caught in the crossfire, Hibiki Kuze and his friends join in the war for humanity's survival by signing contracts with demons to become "Devil Summoners." Soon, their abilities attract the attention of JP's, an underground agency led by Yamato Houtsuin. Once recruited into JP's, Hibiki and his friends fight and bond alongside other ordinary citizens who are Devil Summoners. However, with each new day, another Septentrione appears to wreak havoc upon Japan. Even if many lives are lost in the process, before that night ends, the young summoners must defeat the invaders at all costs. [Written by MAL Rewrite]

Vampires are said to have many weaknesses such as garlic, crosses, and sunlight. Game-loving vampire lord Draluc just so happens to be weak to... everything. He dies, turning into a pile of ash, at the slightest shock. After Vampire Hunter Ronaldo learned of a castle inhabited by a vampire rumoured to have kidnapped a kid, he went there intending to take the devil down. However, the vampire turned out to be Draluc, a wimp who keeps turning into ash at the smallest things. Moreover, the kid wasn't being held captive—he was just using the "haunted house" as his personal playground! When his castle is destroyed, Draluc moves into Ronaldo's office, much to the other's chagrin. Despite their differences, they must try to work together to defend themselves from rogue vampires, Ronaldo's murderous editor, investigators, and more—with Draluc dying continuously along the way. (Source: MU, amended)

Kai, who has powers different from the rest, together with his sickly sister Hikaru was protected by an organization called ASHURUM. Scouted by Eiji, Kai was delegated to the ASHURUM special force AESES and undergo intensive training. Whenever he was free, Kai visited Hikaru at the hospital belongs to the organization, but Hikaru's condition never improved. So, one year later, with amazing growth from the intensive training, Kai decides to escape from the organization. (Source: ANN)

In the dawn of the 21st century, magic, long thought to be folklore and fairy tales, has become a systematized technology and is taught as a technical skill. In First High School, the institution for magicians, students are segregated into two groups based on their entrance exam scores: "Blooms," those who receive high scores, are assigned to the First Course, while "Weeds" are reserve students assigned to the Second Course. Mahouka Koukou no Rettousei follows the siblings, Tatsuya and Miyuki Shiba, who are enrolled in First High School. Upon taking the exam, the prodigious Miyuki is placed in the First Course, while Tatsuya is relegated to the Second Course. Though his practical test scores and status as a "Weed" show him to be magically inept, he possesses extraordinary technical knowledge, physical combat capabilities, and unique magic techniques—making Tatsuya the irregular at a magical high school. [Written by MAL Rewrite]