The present very last aired in 2018 (starting in April and ending in July), but news in regards to the fifth season is a little bit hard to come by. The collection is actually a Japanese anime series based on a light novel series of Japan, prepared by Ichiei Ishibumi. https://toplistar.com/story9216384/detailed-notes-on-highschool-dxd-season-5-release-date-2019