After an explosive encounter with a powerful magic user, Megumin informs her parents that she wants to study explosion magic at the Crimson Demon magic academy called the Red Prison.

Komekko discovers a furry four-legged dinner that Megumin ends up adopting, before the Red Prison conducts a questionable educational exercise.

Megumin has finally achieved her dream of learning Explosion magic, but it takes more than massive eruptions of power to make a living. Saving enough money to set out on her journey might take longer than she ever thought.