RWD sports sedan launched by Toyota in 1998. In Japan, it was sold under the name Altezza, Outside Japan, it was sold under the name Lexus IS (first generation) as a competitor to the Mercedes-Benz C-Class and BMW 3 Series. The Altezza was intended for the European D-segment market, so it had a sedan body with an emphasis on practicality and comfort, but it also had a short overhang body with excellent turning ability and a four-wheel double wishbone suspension with excellent handling performance at a high cost. In reality, the Altezza was a sports car in the shape of a sedan. The Altezza was also available with the famous 3S-GE engine, which had won numerous victories in F3, WRC, JGTC and Pikes Peak, and Toyota considered its dynamic performance to be on a par with that of a sports car. As a result, the Altezza achieved good results in racing as the base vehicle for racing machines, including a long reign as class champion in the Japanese endurance racing series. The Japanese tuning industry welcomed the Altezza as a sedan that was as close to a sports car as possible, and a wide range of tuning options were developed, including retrofitting turbochargers and engine swaps, and the car gained great support from Japan's racing enthusiasts.

The setting is a huge city with a total population of just under 2.3 million, occupying most of western Tokyo. It is called 'School City' because approximately 80% of its population are students. The students of the school city had a special curriculum to develop supernatural abilities, and were assessed at six levels from 'no ability' (level 0) to 'supernatural ability' (level 5), depending on their abilities. The protagonist, Kamijou Touma, is a high school student in Gakusen City, but his assessment is incompetence (Level 0), on the verge of failing. This is because in his right hand is an ability called 'Imagine Breaker', which cancels out anything that has the power of a different ability. On the first day of summer holidays, a sister in a pure white nun's habit suddenly fell from the sky in his room. The girl said. She told him that she had escaped from the world of magic. The "sorceress" appears in pursuit of her, who calls herself "Index". The sorcerer wants the 103,000 grimoires in Index's head. In the battle she is forced to get involved in, she destroys the magic on Index with her right hand, and in exchange for freeing her from her sad fate, she loses her memory. 　Touma spends his days trying not to let anyone know that he has lost his memory, but incidents start to befall him one after another. In order to save Misaka Mikoto, the "Electromaster" who is the third most powerful person in the battle city, from the tragedy she was facing, he has to defeat the "One-way Street" (Accelerator), the number one ranked person in the city. She also has to confront a magician who is planning a confrontation between the "science side" and the "magic side", and uses her right hand to solve crimes across both the worlds of chemistry and magic. One day soon after the start of the second term, Toma is involved in a new and even bigger case. The story begins when "science" and "magic" cross paths once again. The story begins.

A 14-year-old student at Tokiwadai Junior High School, one of the five most prestigious girls' schools in the city. She is the third of only seven "Level 5 psychics" in the city, and is an "Electromagnetic Master" who can manipulate electricity at will. He is also known as the 'Railgun' for his ability to launch coins at three times the speed of sound through the application of electromagnetic force. He and Kamijo met in a certain incident, and have a foul-mouthed relationship that comes back to bite him every time they meet. She has a personality like a split bamboo, and while her unladylike behaviour stands out, she also has a girlish side, with a penchant for fancy goods and cute clothes.