Other Name: Infinite Dendrogram, -インフィニット・デンドログラム-
Summary: In 2043, the dive type VRMMO released. It has a unique system that follows the evolution of various, no, and "infinite" patterns depending on each player. The had elements that could not be realized by VRMMO until then and was technically impossible, quickly became a big movement and swept the world. Reiji Ryoji, a young man who started living alone in Tokyo after taking the university entrance exam, started , which he had been invited to by his brother for a long time, to commemorate the end of his long study for the entrance exam.