User blog comment:Faisal Shourov/Why is Highschool DxD so popular?/@comment-27876048-20160329020528

Apart from things already mentioned I like how the series integrates various mythologies, legends, and fairy tales into the overall storyline and it works there's no contradiction (at least none I've seen)

The second thing I like is how unlike most series based on the supernatural genre there is no black or white sides, instead there is various degrees of gray