After playing a zombie game, Kisei Hanabi saves a girl from a truck and dies in the process. He later finds himself in a fantasy apocalyptic world flooded with zombies that can wield magic! He then unlocks a [Zombie Hunter System] to fight back these undead ghouls. Kisei afterward stumbles upon a princess from the castle and saves her from the horde. As they travel the fantasy world of Gaia, Kisei and Princess Charlotte of the Ruby Kingdom trek to one adventurer’s guild after the other, finding a way to turn back time and return to Earth, away from the infected.