User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-92.188.161.225-20200208002650

https://forums.animesuki.com/showthread.php?p=6398564#post6398564

So, a poster named n0m@n has mentioned that melonbooks is giving a clear file with this illustration on it :

https://melonbooks.akamaized.net/user_data/packages/resize_image.php?image=211000104773g.jpg

What is the chance this is an illustration of Shin 4 ?