High School DxD DX by Ichiei Ishibumi

Translated from Japanese Action Comedy Mature Romance Supernatural School Life Harem Demons Non-human Protagonist Ecchi
A compilation novel series of short stories from the Highschool DxD universe that were published in Dragon Magazine. 1 Volume has been released while another has been scheduled for December 2015.
DX.1. Love Song to the Reincarnated Angel
DX.2. Worship☆Dragon-God Girl!

1: Love Song to the Reincarnated Angel
2: Worship☆Dragon-God Girl