"Alicization" is the third arc of the Sword Art Online series, created by Reki Kawahara. It follows the protagonist, Kirito, as he navigates a new virtual world called Underworld, where he is tasked with protecting a young boy named Alice. This arc explores themes of artificial intelligence and the nature of reality. In Underworld, time flows differently, allowing for complex character development and moral dilemmas. The story delves into the relationship between humans and AI, particularly through the character of Eugeo, Kirito's friend, who plays a crucial role in the narrative.