In the year 2043, the world's first successful full-dive VRMMO, Infinite Dendrogram, was published. In addition to its capacity to flawlessly imitate the five senses, as well as its many other remarkable capabilities, the game promised to immerse players in a world of limitless possibilities. Reiji Mukudori, a soon-to-be college student, is finally able to purchase a copy of the game and begin playing it nearly two years later. Reiji starts on a trip into the realm of Infinite Dendrogram> with the assistance of his experienced elder brother, Shuu, and his sidekick Embryo. What will he find and confront in this gaming world recognized for its remarkable realism and limitless possibilities?