The Introduction Arc is the 1st Story Arc of the Welcome to Demon School! Iruma-kun manga series.
The arc centers around Iruma's introduction and enrollment into Babyls Demon School after a demon, Sullivan, who desires a grandson, buys him off his parents, and brings him to the demon world. Despite not wanting to stand out, Iruma unintentionally makes the teacher, Kalego, his familiar, and befriends two noteworthy demon students in Alice (nicknamed Azz) and Clara.
The arc consists of chapters 1 to 4, and was adapted into episodes 1 to 3 of the 1st season of the anime.
Introduction Arc Summary
Chapter 1: Welcome to Demon School, Iruma-kun!
A human boy named Iruma Suzuki is brought to the demon world after his good-for-nothing parents sold him off to Sullivan; a powerful demon who desires to have a grandson. Sullivan then enrolls his human grandson as a student at Babyls Demon School, which Sullivan serves as the chairman for.Iruma decides not to stand out being a human surrounded by dangerous demons, but he winds up in the spotlight during the school's opening ceremony due to Sullivan leaving him a note to say some demon words. The demon students are caught off guard hearing Iruma chant a powerful demon spell, but nothing happens due to Iruma's lack of magic power. Thus, leaving the students impressed believing that Iruma can say powerful spells without suffering any repercussions.
Due to having his role taken by Iruma as the ceremony's spokesperson, the #1 ranked freshman and noble demon, Alice Asmodeus, challenges Iruma to a duel. Azz shows off his exceptional bloodline fire magic, but Iruma's high evasiveness allows him to easily dodge all the attacks. Iruma then ends up surprisingly winning by performing an unintentional German-suplex upon the demon, which impresses Alice (nicknamed Azz) into becoming Iruma's loyal subordinate.