Viewfinder theory: Asami was probably in a toxic relationship before meeting Feilong, which is why he is lovingly distant and cruel in the first chapters.
I just discovered Kansaijin to hukumen satsujinki and I'm loving it. There are 3 volumes, 2 of those translated into English digitally. I'm dying to read vol 3's chapters and know the ending. I love Dieter so much. π