One day, a girl accidentally finds a compass in the library. She tries to toggle the compass and the world she stays in is changed immediately. She tries to toggle it again, the environment changes again. She generally getting to know how the compass works, and also getting used of its function. In next few minutes, she keeping toggle the compass and she continually enters different worlds. She swims in the ocean and say hello to sea turtles. She stands on a airship and fly in the sky. She really enjoys going to these different new places. However, she accidentally fell down from the airship, and she awakened by the weightlessness. She notices she still stays in the library, everything just now was just a dream.