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.

An unproductive study session results in Megumin and Yunyun having nothing better to do than try and improve Bukkorori's love life.

As the day of both their graduation and the awakening of the Dark God seem to grow ever closer, Megumin gets the feeling Yunyun is keeping secrets from her.

With Komekko missing and monsters running amuck, everything Megumin and Yunyun have learned is put to the test.

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.