User blog comment:B214/Question and Answers 2/@comment-174.119.241.202-20140418202543

why are the past Hakuryuukou so mad at Issei?

I men Odin's the one who came up with the Ketsuryuukou nickname, and by extention Bikou can also be blamed becouse the name Oppai Dragon was invented by him in the first place.