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?
Oh, I'm sorry! I'm really sorry!
Oh, ¡lo lamento! ¡Realmente lo lamento!
Ah, desculpe-me!
Eu realmente sinto muito!