A vast, blue sky. A long and endless mountain path. This is not an excursion, but the journey of three-year-old Xiao Wu and her lamb to the orphanage where they will be abandoned.
Xiao Wu's arrival at the orphanage brings a lot of trouble to the headmistress. Her mentality is that these orphans are better off leaving the orphanage as soon as possible to start their new lives with their adopted families. However, Xiao Wu is different from the other orphans. She locks herself in her little world with her lamb, isolating herself and refusing to communicate with the outside world. She does not care whether she becomes adopted or not. Thus, the headmistress concocts a plan to get rid of the lamb.
One day, the lamb disappears. Some say it went to heaven, somewhere far away among the clouds. Xiao Wu has no apprehension of separation, nor has she ever heard of heaven. All she wants is to be with her companion.