Why is the boxing quartet off the shelf?

There may be the following reasons for removing the boxing quartet:

1. involves sensitive topics, such as Germany in World War II.

2. Because part of the plot or content of the animation did not meet the requirements, it was taken off the shelf.

3. It may be that some plots or contents of the animation caused some complaints or reports and were taken off the shelves.

The specific reasons for the removal need to be judged according to specific official announcements or relevant laws and regulations. I suggest you pay attention to official information and get the latest and most accurate news.