High School DxD

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!"

I’m going to make this school my harem! When a cute girl asks Issei out, he believes his twisted fantasies are finally coming true. Too bad the girl sprouts a pair of black wings and stabs him with a spear on their first date! Saved by his school’s number one beauty, Rias Gremory, Issei is transformed into a demon and made her servant. Issei hopes to rise through the ranks of demonkind to grow powerful enough to create his harem, but in a city with fallen angels and insane priests, he’ll be lucky if he can live long enough to do it! (Source: Yen Press)