During his time in Manchukuo, Amakasu was notorious for his brutality, and the American historian Louise Young described Amakasu as a "sadistic" man who enjoyed torturing and killing people.
Selama waktunya di Manchukuo, Amakasu terkenal karena kebrutalannya, dan sejarawan Amerika Louise Young menggambarkan Amakasu sebagai seorang "sadis" yang suka menyiksa dan membunuh orang.