Junior High School DxD is a spin-off series that takes place after the events of Volume 10 of the original High School DxD Light Novel series.

Junior High School DxD follows Zekka Miyamoto, a descendant of Miyamoto Musashi, blessed (or cursed) with her sword 'Tensei' that steals power from enemies' breasts, transferring them to her own.

After learning that 'Tensei' is a weapon called a sacred treasure, Zekka knocked on Kuoh Academy Junior High School's door to uncover this mystery and make friends! And then she met... the red-haired demon Rias Gremory. A new DxD story of youth at Kuoh Academy, surrounded by eccentric seniors and classmates, and with highly promising sword skills!"