A Guardians of the Video Game parody of Highschool D×D. Ion Hyoukai, the Main Character, was put in internship to a private company called A×A, also known as Atom×Association by the order of the Haoh Academy's dean. There he met Lèas E. Grimory, acommpanied him until his death experience caused by the wielder of the Arsenic power, Ketsu. Leas heals him, and in return, becomes part of the Grimory clan. He now has the responsibility to protect his new adoptive clan and his hometown from the most dangerous Atomic Power that threatens the safety of the his hometown and the residents nearby. As Guardians, Cheat, Patch and Publi, along with Mode, joined their Department's quest, they soon have to face the consequences of this Game's System and the history that caused it to change the male Guardians' gender and their perception towards the Game itself.