SSSS.Gridman

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 Takaradas computer and it tells him to "Remember his calling," but Yuta doesnt understand what this means. Later, in the distance, he sees an extremely large monster but it doesnt move. Its 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.