User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-72.177.176.141-20140723203623/@comment-3325617-20140724001025

It is still not in the DXD main volumes(at least yet) ,he (or it whatever it was) was introduced in a short story that doesn't take place in the main volumes it's just a SS like Let's go to Onsen,Nekomata of the ninja scroll, Erokome etc:)