Luzi and her sister have a secret. They know a spell. Just read it and follow a snail that runs faster than a rabbit to go to the magical crevice. There, they have experienced many incredible adventures, but their favorite is an old bookstore that has been raining all the time. Luzi and her sister found a suspicious black-clothed man when they were heading to the raining bookstore. They hurried to track them, but they lost their way and lost the snail guide. When they finally returned to the raining bookstore, they learned from the owner Mr. Guben that a lot of unusual things had happened in the world of crevices recently, and a lot of things had been lost. It is said that all of this is related to a man in black who has a mysterious appearance. ...