User blog comment:B214/Question and Answers 6/@comment-86.149.63.148-20180916203504/@comment-32573280-20180916210325

It is not a short story so you don't have to worry about where it chronological takes place because I think it is an artbook with additional infomation on the characters it I am a bit unsure on what it is also it comes with Highschool DxD EX which I am sure about.