In a world where humans and witches coexist, the apocalypse is announced. Ayaka, the princess of fire, must protect the young Takayami.

Even though they shared the same bus every morning and sat next to each other in class, Ayaka Kagari, the "Princess" of Tougetsu High School, was nothing more than an unreachable idol for Honoka Takamiya. The horde of students who worshipped the "Princess" was merely a nuisance to Honoka, living his lazy, regular high school life. Everything seemed perfectly normal until, one day, Honoka is attacked out of the blue by a mysterious witch. To his surprise, Ayaka saves his life, revealing herself to be a fire witch on a covert mission to protect Honoka. From that fateful day, the ordinary life of Honoka is turned upside down as he is thrown into the war between the Workshop Witches, who strive to protect the citizens, and the Tower Witches, who desire to steal a power hidden within him.—MAL Rewrite

Takamiya Honoka is just an average student who just so happens to sit next to Kagari Ayaka, the "Princess" of the school, and has never said a word to her. However, one day when Takamiya's life is put in danger, Kagari arrives to his rescue dressed as a witch. It is revealed that Kagari is what is known as a Workshop Witch within the city and Takamiya is under her protection and shall henceforth protect him from any danger that ensues.—Crunchyroll