The Escola is a small connecting area accessible from the Submarine Manga Fields that leads to the Sign Maze after interacting with Moirl outside of the classroom.
Upon first entering from the Submarine Manga Fields, Reshnha will find himself in a small classroom, very much unlike the classrooms in the Abandoned School. The chalkboard at the front of the classroom has a random chance of having 3 different drawings on it, or sometimes even being blank.
Exiting the classroom will reveal it was inside a cube-like building, covered in thick foliage and floating rocks. Down a small path from the entrance stands Moirl. Interacting with him will make an image of him holding a purple soul appear, which will then be quickly replaced by an image of his hands clasped together, smiling slyly. Reshnha will then be transported to the Sign Maze