User blog comment:B214/Question & Answers 5/@comment-77.97.12.117-20150705214444/@comment-26510794-20150706013020

well in matter of knowledge about the underworld in vol 5 when isse went to the Gremory house, Veneranda (rias mother) obligated him to take classes with a personal teacher about manners and the underworld history. i dont think hes dumb at all