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?

A new kaiju appears which poses a problem for Yuta and Gridman. As a result, Rikka and Utsumi are left wondering if their friend will end up long since dead, just like the other students.

The others are finding Yuta's story hard to believe. Nobody wants to confront and ask Akane, but in the meantime, Anti has made plans of his own.

Akane tries to win over the Gridman Alliance by lulling them into a dream. Will they remember each other and Gridman's calling or forever have sweet dreams?