In the after-school classroom of Dujuanhuatai High School in du Li, Xiangyu painted GRIDMAN again and again in her notebook. The world was once created and destroyed by a young girl. What saved the teenager's heart was the super agent GRIDMAN from the different dimension, and the girl made the monster with the soul, as well as Yu Tai and them. Living in a peaceful world, their daily life began to collapse with a loud noise.