Yuta Hibiki wakes up in the home of his classmate, Rikka Takarada, with amnesia. A voice from an old computer, identifying himself as "Gridman," has a mission for him, but can he even survive the next day of school without his memories?
--Who?
--Gridman.
Von wem?
-¿Quién?
-Gridman.
– Qui ?
– Gridman.
-Quem?
-Gridman.