Thread:An Advocate for Manga/@comment-26841482-20151104164512/@comment-27078917-20151107183329

I believe it has to do with the Sunlit garden. As we know, Hairu and Arima are from the Sunlit garden, maybe the almost sadistic way to learn for Haise are the same ways to learn in the Sunlit garden. Maybe Arima only knows this training Method.