While exploring Wiz's magic shop with his party, Kazuma Satou finds a magical wish-granting choker and decides to try it on. Only then does Wiz tell him that the choker strangles its wearer to death in four days unless their desires are fulfilled. This wouldn't be a problem if Kazuma knew what his wish was. Fearing for Kazuma's life, Aqua, Megumin, and Lalatina "Darkness" Dustiness Ford all agree to do his bidding in order to satisfy his desires and hopefully grant his wish, no matter what he asks for...

It is not strange that the Demon Lord's forces fear the Crimson Demons, the clan from which Megumin and Yunyun originate. Even if the Demon Lord's generals attack their village, the Crimson Demons can just easily brush them off with their supreme mastery of advanced and overpowered magic.

When Yunyun receives a seemingly serious letter regarding a potential disaster coming to her hometown, she immediately informs Kazuma Satou and the rest of his party. After a series of wacky misunderstandings, it turns out to be a mere prank by her fellow demon who wants to be an author. Even so, Megumin becomes worried about her family and sets out toward the Crimson Demons' village with the gang.

There, Kazuma and the others decide to sightsee the wonders of Megumin's birthplace. However, they soon come to realize that the nonsense threat they received might have been more than just a joke.

Kazuma meets a novice adventurer called Ran who claims to be Kazuma's fan. A quest is proposed to Kazuma and his party in front of Ran, so he accepts the quest to look good in front of his fan; after some convincing, they all go to fight the metal golem.

Kiki, a 13-year-old witch-in-training, must spend a year living on her own in a distant town in order to become a full-fledged witch. Leaving her family and friends, Kiki undertakes this tradition when she flies out into the open world atop her broomstick with her black cat Jiji.

As she settles down in the coastal town of Koriko, Kiki struggles to adapt and ends up wandering the streets with no place to stay—until she encounters Osono, who offers Kiki boarding in exchange for making deliveries for her small bakery. Before long, Kiki decides to open her own courier service by broomstick, beginning her journey to independence. In attempting to find her place among the townsfolk, Kiki brings with her exciting new experiences and comes to understand the true meaning of responsibility.