As you all remember, after three seasons serialised by TNK studio - first in 2012, second in 2013 and third in 2015 - there was a long pause, due to the series going COMPLETELY off of the original story of the light novels, which resulted displeasure and complains from the fans.
Then, after a 3-year long pause, new long-awaited season 4 finally appeared in 2018, serialized by Passion studio.
So taking that to a count, High School DxD should get a season 5 soon.
But the question remains is: WHEN?
Leave a comment on your suggestions on DxD getting a 5th season.