Based on a true story.
Firstly, I had no idea of this movie because I neither had read the plot nor seen the poster which has Japanese title. So I just thought it might talk about a zoo.
Yes it was. But the zoo was for people.
Secondly, according to the history of those periods, hiding Jews from Nazi could kill people who helped Jews. However it's also the fact that there were many of them like Jan and Antonina.
Lastly, I hope it will never happen again. No mistake.