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?
--Hey!
--Oh, you heard that?
Oh! Das hast du gehört?
-¡Oye!
-¡Oh, ¿escuchaste eso?
-Ei!
-Ah, escutou isso?