The leader of the Corruptors. At first he is a good program created by Dr. Inukai to manage and maintain the vastgrowing ComNet. His contact with Yui made him want to live and later to create a world where he could live. Dr. Inukai who saw the change in Grosser decided to create the Correctors to restore him to his current status. When Dr. Inukai chooses Haruna as Corrector Grosser who was fascinated with arguablyloved Yui from beginning manipulated I.R. and set Dr. Inukai in accident so that Yui would be the Corrector instead of Haruna.