The Magical Street Arc is the 12th Story Arc of the Welcome to Demon School! Iruma-kun manga series.
The arc centers around Sullivan taking Iruma to Magical Street in order to pick up supplies for the latter's second first-year school term. Iruma also starts to become interested in possibly becoming the Demon King, which Sullivan tells him about Demon King Delkira and the current peaceful netherworld the latter created.
The arc consists of chapters 92 and 93, and was adapted into episode 21 of the 2nd season of the anime.
Magical Street Arc Summary
Chapter 92: Magical Street
Sullivan declares all 3 of the Walter Park teams as the winner, which the Abnormal students celebrate with a party. However, Kalego takes this as everyone being deemed the loser, which he follows through with punishing everyone with double the homework over semester break. Iruma works on his homework over the course of the break, and once he's finished, Opera brings up that it's time to start preparing for the second semester. Sure enough, Sullivan appears as he has a bit of free time to go shopping with his grandson.With Opera following along, Sullivan takes Iruma to Magical Street; a shopping district where they will be picking up supplies for Iruma's next school semester. Iruma shops around Magical Street with Sullivan and Opera for many different items that could be useful for Iruma. They also visit the book store for spell learning text books that Iruma will be learning throughout the next semester, such as a "fractal" spell that makes Iruma weight-less to the point of being able to float. When Sullivan shows off his magic on a shoplifter, Iruma's attention is brought to several book store employees discussing the oddity that Sullivan's not choosing to become Demon King despite being a top candidate Rank 9 (Tet) demon.
After they finish shopping, Opera leaves to drop off the school supplies at the house. Left alone, Iruma and Sullivan have a heart-to-heart where Sullivan is glad to hear that his grandson is enjoying his time at school. Iruma then changes the subject asking Sullivan how one becomes the Demon King.
Chapter 93: The One Who Controls Underworld
Sullivan reminisces about Demon King Delkira having served as the latter's subordinate at some point in the past. From a high platform, Delkira looks down at the underworld he created, and notes to Sullivan how great of a view it is. In the present, Sullivan gets excited that Iruma is showing interest in becoming Demon King, but Iruma corrects him that he only wants to know about the Demon King after hearing people talking about it.Agreeing to discuss it, Sullivan explains how the Demon King is the underworld itself. That whoever becomes Demon King has control over everything and everyone to shape the underworld into whatever they desire. Looking around Magical Street, Sullivan points out that the underworld Iruma's currently experiencing is the one that was crafted by Demon King Delkira, which Iruma gets it that Delkira must have been a fun person. Sullivan adds that he has no interest in becoming Demon King as he would just turn it into a world that worships his grandson, but he states in a serious manner that he's interested in seeing what Iruma's desired underworld would look like, which leaves an impact on Iruma.
Shortly after, Opera returns to take them home. Before leaving, Iruma takes one last look at his surroundings wondering what it would look like if he was the Demon King. After returning home, Sullivan wishes to spend what's left of his free time to play with his grandson. However, Iruma makes it clear that he already has plans on the last day of semester break; his date with Ameri.
