Pipe
On your bamboo roof is a bear. It is pulling the bamboo off, because it wants to use it to make a long pipe.
Bamboo is great for pipes, and the only place for the bear to get it is your roof. So, that's why it's there.
かん
くだ
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The pipe will be for Genghis Khan (かん), who would like some pipes for his house.
Watch the bear take away your bamboo. Follow it to Genghis Khan's house. There, the bear installs the pipe in Genghis Khan's bathroom.