Lin Ming has been in this world for sixteen years, always believing it to be an ordinary one. He copies novels, saves up small amounts of money, and dreams of a simple and happy life with female seniors on his left and female juniors on his right.

It wasn't until he stepped into Kuoh Academy and saw Toujou Koneko's cat ears, Himejima Akeno's lightning, and Rias's destructive magic... that he realized with despair that this was "High School DxD," a place where people could die! The aftershocks of the mystical powerhouses fighting could obliterate him.

In a moment of crisis, the Infinite Dimensional System awakens: Afraid to become stronger? Newbie quests force you to make extra-long confessions to three popular heroines! Too afraid to take risks? Then traverse countless worlds for forced training!