User blog comment:B214/General Discussion/@comment-30924344-20170612073704

https://twitter.com/ishibumi_ddd/status/874126230219497472 From what I read from this tweet, DxD in kanji means Devil High School so Ishibumi has just told us [well to us non Japanese speakers indirectly] that the official full title of High School DxD is "High School Devil High School". Makes sense and it should have been obvious because Kuoh Academy is literally full of 80% devils or so.