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Synopsis

Yuuta Hibiki regains consciousness in Rikka Takarada’s room with two unsettling realizations: his memories are gone, and a voice from a nearby chamber calls his name. Investigating, he uncovers an old computer housing a robot that identifies itself as Hyper Agent Gridman. Rikka cannot perceive Gridman, nor does she notice the foreboding creatures emerging through a dense fog that is spreading over the town. When a massive monster appears and causes widespread destruction, Yuuta is drawn back to the machine and merges with Gridman, instantly thrust into a frontline confrontation. Joined by Rikka and their classmate Shou Utsumi, Yuuta helps form the Gridman Alliance to repel the invading monsters and uncover who is behind their appearance.