True High School DxD Vol. 1 (Light Novel)

Pervy high school demon Issei Hyodo’s mission to become the Harem King continues in this sequel! It’s been a year and a half since Issei became a servant of Rias’ and he has finally advanced to being a high-ranking demon. But while he is enjoying his life and getting closer to the girls, he one day happens upon a girl being attacked by an unknown demon. With the situation being all too familiar to him, he decides to save her just like he was first saved. It’s time for the wielder of the Boosted Gear to show what he’s made of once more! The boob and blood-filled story enters a new chapter!
Notice: This book is written in Japanese.