Talk:Kishou Arima/@comment-26306690-20151006234744/@comment-10733658-20151006235348

Chapter 123, when everyone is writing their wills.

Hirako explains it to Kuramoto, and states it's because Arima doesn't have anything to write. From Jack, it seems like Arima never had a normal life so he probably never had a family or friends to leave behind.

It's hard to say at this time whether Kaneki surviving was planned or a happy accident. We also don't know whether it was Arima's plan/intention, or the whole thing is simply him doing as he's told.