AI Buster is a novel based on the popular game series, .hack. Albireo is a high-level player who secretly is the head of the Cobalt Knight Brigade or The World's Debugging Squad. He has been tasked with finding and deleting the Vagrant AI Lycoris, who has proved to be invincible to normal deletion. He doesn't know that his attempts will send him on a crash course with famous players such as W.B. Yates the famous net poet, the Ghost of the Church, and the predestined "Descendants of Fianna" Orca and Balmung.