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?
Ah, if only this were the Ultra Series!
¡Ah, si tan solo
esta fuera de las Ultra Series!
Ah, se isso fosse um episódio
da Série Ultra!