"The Irregular at Magic High School: Visitor Arc" is a sequel to the original series, focusing on the characters Tatsuya Shiba and his sister Miyuki. The story unfolds as they face new challenges and threats while attending a magic school. The arc introduces new characters and explores the dynamics of magic in a competitive environment. The plot centers around a foreign exchange program that brings students from other countries to Japan. Tensions rise as rivalries develop, and Tatsuya's unique abilities come into play. The arc delves into themes of friendship, loyalty, and the complexities of magic, enriching the overall narrative of the series.