User blog comment:B214/Volume 22 spoilers/@comment-2.218.32.235-20161226164521

From the new illustration that was uploaded on the Volume 22 page, since the text says DxD final chapter and shows two dragons which represent Issei and Vali, then that means the final chapter of DxD will be focused on their fight; an expy to the end of Naruto Shippuden where Naruto and Sasuke fought.