As the sun in Maria's World was bright and shiny, the cover on the floating castle was finally able to be taken off of its base. Verthandi and Delmedi lived happily in the floating castle for a long time.
The castle had a playground, library, a botanical garden, and even some strange buildings that Lu Zhiyu had built on the ground floor. Their favorite part about living there, however, was that they could see the stars from nearly every corner of the castle whenever they looked up to the sky.
Now that they were back in Maria's World, both of them were very happy. One day, they were playing around in the castle, when they rushed into the study where Lu Zhiyu was usually resting. At this moment, however, Lu Zhiyu was not there.
So, they starting horsing around in Lu Zhiyu's room, hitting each other with couch cushions. Then, they found a heavy book on the table.
"What is that book?" one of them asked.
