I was broswing twitter and found this by accident:
https://books.rakuten.co.jp/rb/15299247/
It's called 悪ノ少年 (Aku no Shounen / The Boy of Evil ), but it's still a temporary title. It's written by mothy and published by PHP. Apparantly it will be released February 2018. Other than that there doesn't seem to be any information about it.