User blog comment:Xhatefate/DxD Updates~/@comment-185.112.105.215-20161101044850/@comment-2.24.39.78-20161101224520

I remember a very brief description posted either somewhere on this wikia or on an Animesuki thread but that was years ago.

Issei and very least Asia visits Issei's grandmother. A stray devil or a vampire (I am not sure) is close by and they meet up with Seek and Elmen to deal with it. Afterwards Issei and Asia go back to Granny's and she asks to be expecting a great grandchild thinking that the reason they left eariler was to go have "you know".