Imano Yuki

Keita Sato (41, single) is overworked at his corporate job, dealing with tedious and stressful tasks day in and out. How does he relieve his stress? By sneaking into modern-day "dungeons," using them as a batting cage, and blasting away ferocious monsters! One day, his live-in niece Hikari secretly follows him and livestreams his adventures, only for his unbelievable strength to go crazy viral!! Keita unknowingly captures the attention of not only viewers, but other big-name streamers.

Yuta Hibiki awakens with amnesia and the ability see things that others cannot. He first encounters a Gridman in the reflection of his friend Rikka Takarada's computer and it tells him to "Remember his calling," but Yuta doesn't understand what this means. Later, in the distance, he sees an extremely large monster but it doesn't move. It's only when Yuta gets to school that the two sightings make sense: a monster attacks and the hero Yuta saw in the computer screen pulls him within the computer and transforms Yuta into a giant hero named Gridman.