User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-72.148.177.121-20150727223553/@comment-92.40.249.25-20150728170330

There is most likely going to be a fifth arc (hopefuly) as the author as set us up for visiting the werewolves,(Loup Gaeou), the five familes (new additions to student council), Grim Reapers (Bennia) and the new student council and ORC under Xenovia and Asia and issei's high class premotion. Just because Issei will no longer get any major power ups it does not mean that the series will end soon,just look at series like Fairy Tail and Camione!. They both have long periods of times where the main charcther does not recive any major power ups if any and the later is a harem/e hi series so it is unlikely that DxD is going to end soon. The series will most likely be geared towards other aspects of Issei's growth.