Yuuta Hibiki wakes up in the room of Rikka Takarada and notices two things: he has no memories, and he can hear a mysterious voice calling his name from a nearby room. On further inspection, he finds a robot—which introduces itself as Hyper Agent Gridman—behind the screen of an old computer. Much to Yuuta's surprise, Rikka cannot hear Gridman, nor can she see the ominous monsters looming over a thick fog as it envelopes the town outside.
Another giant monster materializes in the city and proceeds to wreak havoc. Amidst the confusion, Yuuta is once again drawn to the old computer and merges with Gridman. Suddenly, he appears in the middle of the battle and is forced to fight the monster. Together with Rikka and fellow classmate Shou Utsumi, Yuuta forms the "Gridman Alliance" to defeat the monsters plaguing the city and find whoever is responsible for their emergence.
[Written by MAL Rewrite]+ More
Characters & Voice Actors

Gridman
Main
Hibiki, Yuuta
Main
Shinjou, Akane
Main
Takarada, Rikka
Main
Utsumi, Shou
Main
Anti
Supporting
Borr
Supporting
Hass
Supporting
Kaijuu Shoujo Anosillus (2-daime)
Supporting
Kerib, Alexis
SupportingRecommended for you
Berserk of Gluttony
TV
23m
Under Ninja
TV
24m
MF Ghost
TV
24m
Arknights: Perish in Frost
TV
24m
Shy
TV
24m
Bullbuster
TV
24m
KamiErabi GOD.app
TV
22m
Protocol: Rain
TV
23m
Onimusha
ONA
28m
Good Night World
ONA
24m
Gundam Build Metaverse
ONA
24m