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!"

A new student steps up to the gates of Kuoh Academy junior division. Zekka, a descendant of Miyamoto Musashi, wields the sword-shaped Sacred Gear "Tensei." Her goal? To make friends at Komaou Academy!? A new "DxD" series begins, guided by unique friendships and by Rias and the other high school students! (Source: Kadokawa, translated)

Cress is a member on the team of the nine strongest people in the world, feared even by the Demon King himself. His new mission is to monitor the beautiful girl summoned from Japan who could potentially be the next Hero!? The 9th most powerful person in the world and the strongest ice mage is about to begin a turbulent undercover school adventure!