Academy city is renowned for its scientific advancement and hosts an esper development program. the seven most powerful espers are known as "level 5," with middle schooler mikoto misaka being ranked third on the list due to her ability to manipulate electricity, earning her the nickname "the railgun." when a series of peculiar events unfold throughout the city, they all seem to be linked to an elusive device called the level upper, which is said to enhance the user's esper abilities. as the situation intensifies, it becomes clear that there is more to this mysterious gadget than meets the eye. it turns out that academy city may not be as utopian as it appears on the surface, and mikoto and her friends find themselves entangled in a dangerous web of secrets and intrigue.