If you read about the history of the kidnappings it is more than little disturbing, including how the North Korean government actually thought they could force people they kidnapped to return by holding their children hostage.
Ah, Japan. They'll publicize and release (for free!) a manga about another nation's atrocities towards their country, hoping to increase awareness and incite indignation, but when
another manga points out Japan's own dirty past atrocities, it gets censored and suspended, and many Japanese citizens still refuse to admit that it actually occurred.
I'm not criticizing Yokota's family or the mangaka, but the Japanese attitude. Yes, it is very tragic and terrible that North Korea would kidnap and kill those 20-80 Japanese citizens, but I should think North Korea's nonchalant attitude towards that incident isn't much better than Japan's continued refusal to acknowledge the rape and murder of hundreds of thousands of Chinese civilians (and this doesn't even count events outside of Nanking, like in the rest of China or Korea).
Just saying.