High School DxD author Ichiei Ishibumi has been spreading the word via Twitter that a third season of the anime adaptation is now in the works. Seasons 1 and 2 aired in 2012 and 2013 respectively, and were both licensed by FUNimation.
DxD is a supernatural action comedy with heavy ecchi content. Here’s the plot summary from ANN:
The story follows Issei Hyōdō, a dim-witted, lecherous second-year high school student who is killed by a girl on his first date ever. Issei is reincarnated as a devil, and from that day forward, he serves as an underling of Riasu, a high-level devil who is also the prettiest girl on Issei’s campus.
Scheduling plans for the new season have not yet been announced.