User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-50.241.248.226-20150721203927/@comment-108.224.166.119-20150722181427

But Ishibumi has been putting other forms of mythos into the Highschool DXD storyline like there's the Alice in Wonderland themes he's been putting all over the place and in SLASH/DOG there was mention of the Wizards of Oz I believe