User blog comment:B214/High School DxD BorN episode 1 review/@comment-24.64.83.13-20150411015625/@comment-97.103.233.248-20150411031205

After watching this episode I have no doubt that they will make a season 4 if given the chance. But in my opinion they might aim to stop the anime series at season 6. My reason for saying this is because cao cao and the hero faction escape in LN 9, and you can't just end a series when you let the villains just walk away. I think they'll have issei finish his fight with cao cao.

Season 5:LN 8 extra life,9 and 10

Season 6: LN 11 and 12