User blog comment:B214/High School DxD Hero Discussion/@comment-37.232.84.242-20181231134658/@comment-33525146-20190223131333

Actually, Shin is not a continuation of season 4. Season 4 reaches the 10th volumne of the Light Novels, and before Shin there are lots of extra Light Novels, 15 volumes, actually, that have not been adapted yet, and take place before Shin starts. There's source material for, at the very least, 5 more seasons before even considering getting into Shin HS DxD