Hisotrically, the Ainu have been marginalized in their own lands, in much a similar way as Native Americans. In fact, the Japanese government officially recognized that the Ainu are an indigenous group in June of this year.
Thought the Ainu have lots of obstacles, that doesn’t exempt their flag from ridicule. Officially, the blue represents the sky, the white is snow and the red is an arrow. In truth, though, I think the white line is obviously a squid. The blue is the sea and the red shape is a harpoon. The flag secretly represents the Ainu tradition of calamari stabbing, which culminates with a major festival every August. Squid shish kebabs, squid waffles, squid yogurt, squid upside down cake, squid burgers and squid pizza. But because the Japanese are such advocates of the preservation of sea creatures, the Ainu have to hide the glory of their festival into their flag. Kind of like the Da Vinci Code.