The Arikured Arc is the 7th Story Arc of the Welcome to Demon School! Iruma-kun manga series.
The arc centers around the spirit within Iruma's Ring of Gluttony becoming sentient enough to properly communicate with Iruma, which they figure out that the spirit's becoming stronger the higher Iruma goes up in the demon ranks. Along with Iruma coming up with a form for said spirit, it decides to call itself Arikured (nicknamed Ali).
The arc consists of chapters 44 and 45, and was adapted into episode 1 of the 2nd season of the anime.
Arikured Arc Summary
Chapter 44: How to use Magic
Iruma continues to get the hang of using his Ring of Gluttony to cast magic, such as being able to transform the color of a frog during Morax Momonoki's transfiguration class. Shortly after, the spirit of the ring finally makes its reappearance much to Iruma's confusion, and it's even more of a surprise when it turns out that the spirit can actually speak now. Iruma goes to hide in one of the school's empty Back Rooms to get a handle of the situation, which the spirit scolds Iruma for using the ring's magic rather poorly up to this point.Providing Iruma with a bit of a lesson that all magic is based on imagination, the spirit asks for Iruma to think up a body for it using the same transformation magic from Morax's class. As a result, Iruma's imagination turns the ring spirit into a small one-eyed humanoid demon in a classy suit, which it accepts. The spirit then provides Iruma a bit of a test where the boy has to cast the transformation spell on himself in order to change into different sets of clothing. The toughest one being to transform into clothing that Iruma would never choose to wear. Meanwhile, Ameri's been distraught over the sight of seeing "Irumi" during the Kuromu concert, and wonders if Iruma is actually a pervert. She investigates the Back Room upon seeing magic cast within it, and is left shocked in disbelief at the sight of Iruma now wearing a female Akudol outfit.
Chapter 45: The Mystery of the Ring
Due to the ring spirit wanting to stay hidden, the shocked Ameri runs off unable to process what she just saw. The spirit explains that it's scared to reveal itself at the moment due to how unknown its life is, and points out that Iruma should understand what it feels like to not want to stand out, which he admits he does. However, the spirit states that it will gladly show itself once it knows what it actually is, which sets Iruma off on a quest to discover the past of his Ring of Gluttony spirit. Unfortunately, he comes up empty speaking to Sullivan, and looking through the school library, as no one seems to believe that a spirit is housed within the ring.Having to do things himself, Iruma uses the bits of information of what the spirit remembers to form a timeline of when it started becoming conscious. The two of them soon realize that the spirit's evolution is actually connected to Iruma's rise through the demon rankings where the spirit remained unconscious at Rank 1 (Aleph), became conscious but couldn't speak at Rank 2 (Bet), and was finally able to speak once Iruma had achieved Rank 3 (Gimmel). As a result, Iruma becomes excited at what the spirit's next evolution will be once Rank 4 (Daleth) is achieved, even though going this route will require him to stand out again. Knowing that they're going to be in this long journey together, the spirit asks for Iruma to call him Ali, short for "Arikured," from now on. In the end, despite being happy that he solved a part of the Ali-mystery, Iruma eventually realizes that he still hasn't cleared up the misunderstanding with Ameri.
